Diamond bearing Kimberlite - Cabochon - Big Hole, Kimberley Mine - South AfricaKimberlite collected at the Big Hole mine dumps in 1995 Size : 19.9 x 19.2 x 5.0 mm Weight : 19.6 caratKimberliteKimberlite is an igneous rock best known for sometimes containing diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond in 1871 spawned a diamond rush, eventually creating the Big Hole.Kimberlite occurs in the Earth's crust in vertical str...uctures known as kimberlite pipes as well as igneous dykes and sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatilecomponents. It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.Kimberlite has attracted more attention than its relative volume might suggest that it deserves. This is largely because it serves as a carrier of diamonds and garnet peridotitemantle xenoliths to the Earth's surface. Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important. In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between thecratonic continental lithosphere and the underlying convecting asthenospheric mantle.Morphology and volcanologyMany kimberlites are emplaced as carrot-shaped, vertical intrusions termed 'pipes'. This classic carrot shape is formed due to a complex intrusive process of kimberlitic magma which inherits a large proportion of CO2 (lower amounts of H2O) in the system, which produces a deep explosive boiling stage that causes a significant amount of vertical flaring (Bergman, 1987). Kimberlite classification is based on the recognition of differing rock facies. These differing facies are associated with a particular style of magmatic activity, namely crater, diatreme and hypabyssal rocks (Clement and Skinner 1985, and Clement, 1982).The morphology of kimberlite pipes, and the classical carrot shape, is the result of explosive diatreme volcanism from very deep mantle-derived sources. These volcanic explosions produce vertical columns of rock that rise from deep magma reservoirs. The morphology of kimberlite pipes is varied but generally includes a sheeted dyke complex of tabular, vertically dipping feeder dykes in the root of the pipe which extends down to the mantle. Within 1.52 km (0.931.24 mi) of the surface, the highly pressured magma explodes upwards and expands to form a conical to cylindrical diatreme, which erupts to the surface. The surface expression is rarely preserved, but is usually similar to a maar volcano. The diameter of a kimberlite pipe at the surface is typically a few hundred meters to a kilometer (up to 0.6 mile).PetrologyBoth the location and origin of kimberlitic magmas are areas of contention. Their extreme enrichment and geochemistry has led to a large amount of speculation about their origin, with models placing their source within the sub-continental lithospheric mantle (SCLM) or even as deep as the transition zone. The mechanism of enrichment has also been the topic of interest with models including partial melting, assimilation of subducted sediment or derivation from a primary magma source.Historically, kimberlites have been subdivided into two distinct varieties termed 'basaltic' and 'micaceous' based primarily on petrographic observations (Wagner, 1914). This was later rev
Natural rough kimberlite - Kimberley Mine - South AfricaDue to highly mechanised diamond mining methods it is very difficult to find a diamond on matrixThis specimen was collected at the Big Hole mine dumps in Kimberley, South Africa late 1990's Kimberlite Specimen Size : 45 x 38 x 27 mm Specimen Weight : 56.31 grKimberliteKimberlite is an igneous rock best known for sometimes containing diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.7...0 g) diamond in 1871 spawned a diamond rush, eventually creating the Big Hole.Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes as well as igneous dykes and sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatilecomponents. It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.Kimberlite has attracted more attention than its relative volume might suggest that it deserves. This is largely because it serves as a carrier of diamonds and garnet peridotitemantle xenoliths to the Earth's surface. Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important. In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between thecratonic continental lithosphere and the underlying convecting asthenospheric mantle.Morphology and volcanologyMany kimberlites are emplaced as carrot-shaped, vertical intrusions termed 'pipes'. This classic carrot shape is formed due to a complex intrusive process of kimberlitic magma which inherits a large proportion of CO2 (lower amounts of H2O) in the system, which produces a deep explosive boiling stage that causes a significant amount of vertical flaring (Bergman, 1987). Kimberlite classification is based on the recognition of differing rock facies. These differing facies are associated with a particular style of magmatic activity, namely crater, diatreme and hypabyssal rocks (Clement and Skinner 1985, and Clement, 1982).The morphology of kimberlite pipes, and the classical carrot shape, is the result of explosive diatreme volcanism from very deep mantle-derived sources. These volcanic explosions produce vertical columns of rock that rise from deep magma reservoirs. The morphology of kimberlite pipes is varied but generally includes a sheeted dyke complex of tabular, vertically dipping feeder dykes in the root of the pipe which extends down to the mantle. Within 1.52 km (0.931.24 mi) of the surface, the highly pressured magma explodes upwards and expands to form a conical to cylindrical diatreme, which erupts to the surface. The surface expression is rarely preserved, but is usually similar to a maar volcano. The diameter of a kimberlite pipe at the surface is typically a few hundred meters to a kilometer (up to 0.6 mile).Two Jurassic kimberlite dikes exist in Pennsylvania. One, the Gates-Adah Dike, outcrops on the Monongahela River on the border of Fayette and Greene Counties. The other, the Dixonville-Tanoma Dike in central Indiana County, does not outcrop at the surface and was discovered by miners.1PetrologyBoth the location and origin of kimberlitic magmas are areas of contention. Their extreme enrichment and geochemistry has led to a large amount of speculation about their origin, with models placing their source within the sub-continental lithospheric mant
For your consideration is this large specimen of diamond-bearing (not neccessarily in this sample however) kimberlite ore from the Kimberley Mine in South Africa. A nice large specimen of typical "blue ground" kimberlite from an iconic locality. Rare Specimen Dimensions: 13 x 9.5 x 10 cm. Weight: 882 grams
Diamond bearing Kimberlite - Cabochon - Big Hole, Kimberley Mine - South AfricaKimberlite rough collected at the Big Hole mine dumps in 1995 Size : 24 x 23.6 x 6.6 mm Weight : 44.15 caratKimberliteKimberlite is an igneous rock best known for sometimes containing diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond in 1871 spawned a diamond rush, eventually creating the Big Hole.Kimberlite occurs in the Earth's crust in vertica...l structures known as kimberlite pipes as well as igneous dykes and sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatilecomponents. It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.Kimberlite has attracted more attention than its relative volume might suggest that it deserves. This is largely because it serves as a carrier of diamonds and garnet peridotitemantle xenoliths to the Earth's surface. Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important. In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between thecratonic continental lithosphere and the underlying convecting asthenospheric mantle.Morphology and volcanologyMany kimberlites are emplaced as carrot-shaped, vertical intrusions termed 'pipes'. This classic carrot shape is formed due to a complex intrusive process of kimberlitic magma which inherits a large proportion of CO2 (lower amounts of H2O) in the system, which produces a deep explosive boiling stage that causes a significant amount of vertical flaring (Bergman, 1987). Kimberlite classification is based on the recognition of differing rock facies. These differing facies are associated with a particular style of magmatic activity, namely crater, diatreme and hypabyssal rocks (Clement and Skinner 1985, and Clement, 1982).The morphology of kimberlite pipes, and the classical carrot shape, is the result of explosive diatreme volcanism from very deep mantle-derived sources. These volcanic explosions produce vertical columns of rock that rise from deep magma reservoirs. The morphology of kimberlite pipes is varied but generally includes a sheeted dyke complex of tabular, vertically dipping feeder dykes in the root of the pipe which extends down to the mantle. Within 1.52 km (0.931.24 mi) of the surface, the highly pressured magma explodes upwards and expands to form a conical to cylindrical diatreme, which erupts to the surface. The surface expression is rarely preserved, but is usually similar to a maar volcano. The diameter of a kimberlite pipe at the surface is typically a few hundred meters to a kilometer (up to 0.6 mile).PetrologyBoth the location and origin of kimberlitic magmas are areas of contention. Their extreme enrichment and geochemistry has led to a large amount of speculation about their origin, with models placing their source within the sub-continental lithospheric mantle (SCLM) or even as deep as the transition zone. The mechanism of enrichment has also been the topic of interest with models including partial melting, assimilation of subducted sediment or derivation from a primary magma source.Historically, kimberlites have been subdivided into two distinct varieties termed 'basaltic' and 'micaceous' based primarily on petrographic observations (Wagner, 1914). This was late
Diamond bearing Kimberlite - Cabochon - Big Hole, Kimberley Mine - South AfricaKimberlite rough collected at the Big Hole mine dumps in 1995 Size : 19.3 x 16.1 x 6 mm Weight : 19.95 caratKimberliteKimberlite is an igneous rock best known for sometimes containing diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond in 1871 spawned a diamond rush, eventually creating the Big Hole.Kimberlite occurs in the Earth's crust in vertica...l structures known as kimberlite pipes as well as igneous dykes and sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and are erupted rapidly and violently, often with considerable carbon dioxide and other volatilecomponents. It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.Kimberlite has attracted more attention than its relative volume might suggest that it deserves. This is largely because it serves as a carrier of diamonds and garnet peridotitemantle xenoliths to the Earth's surface. Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important. In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between thecratonic continental lithosphere and the underlying convecting asthenospheric mantle.Morphology and volcanologyMany kimberlites are emplaced as carrot-shaped, vertical intrusions termed 'pipes'. This classic carrot shape is formed due to a complex intrusive process of kimberlitic magma which inherits a large proportion of CO2 (lower amounts of H2O) in the system, which produces a deep explosive boiling stage that causes a significant amount of vertical flaring (Bergman, 1987). Kimberlite classification is based on the recognition of differing rock facies. These differing facies are associated with a particular style of magmatic activity, namely crater, diatreme and hypabyssal rocks (Clement and Skinner 1985, and Clement, 1982).The morphology of kimberlite pipes, and the classical carrot shape, is the result of explosive diatreme volcanism from very deep mantle-derived sources. These volcanic explosions produce vertical columns of rock that rise from deep magma reservoirs. The morphology of kimberlite pipes is varied but generally includes a sheeted dyke complex of tabular, vertically dipping feeder dykes in the root of the pipe which extends down to the mantle. Within 1.52 km (0.931.24 mi) of the surface, the highly pressured magma explodes upwards and expands to form a conical to cylindrical diatreme, which erupts to the surface. The surface expression is rarely preserved, but is usually similar to a maar volcano. The diameter of a kimberlite pipe at the surface is typically a few hundred meters to a kilometer (up to 0.6 mile).PetrologyBoth the location and origin of kimberlitic magmas are areas of contention. Their extreme enrichment and geochemistry has led to a large amount of speculation about their origin, with models placing their source within the sub-continental lithospheric mantle (SCLM) or even as deep as the transition zone. The mechanism of enrichment has also been the topic of interest with models including partial melting, assimilation of subducted sediment or derivation from a primary magma source.Historically, kimberlites have been subdivided into two distinct varieties termed 'basaltic' and 'micaceous' based primarily on petrographic observations (Wagner, 1914). This was late
MineralMan999 Native GoldHomestake Mine, Lead, Lead Mining District, Lawrence Co., South Dakota, USA3.3cm x 2.7cm x 2.3cm DescriptionInteresting Notes: An unusually rich example of native gold from this historic South Dakota locale This specimen hosts a rich showing of native gold, intimately intergrown throughout the characteristic matrix of darkly colored schist and quartz The native gold is quite rich throughout the entire specimen The specimen has been expertly cut and polished on one side ...to show just how rich this specimen is This specimenretains an old, unattributed, handwritten label as well Classic, old time material The pics hardly do it justice Must be seen in person to be fully appreciatedGood luck and be sure to check out my other exciting mineral auctions on ebay STAY TUNED ALL AUCTIONS END THURSDAY, AUGUST 1st The MineralMan Pledge: To offer a variety of interesting and unique mineral specimens that stand out from the majority of specimens on ebay and to add new specimens AT LEAST every week, all with an opening bid of JUST 1, NO RESERVE.Click here to see More INCREDIBLE MineralsBidding for auctions starts at JUST 1, NO RESERVEWe accept PayPal, - if you have questions about any other payment methods, please askSpecimens ship weeklyHigh bidder pays shippingFull Money Back Guarantee (less shipping)We combine shippingAdd Mineralman999 to My Favorite SellersINTERNATIONAL BIDDERS PLEASE NOTE:Items will ship USPS EXPRESS MAIL INTERNATIONAL or USPS PRIORITY MAIL INTERNATIONAL ONLY. Both of these methods are trackable, and the Express option is insured and guaranteed. For rates, refer to the USPS website or contact us directly.
KIMBERLITE KimberliteKimberley, South AfricaBig Hole mineIgneous rockBrecciaBlue GroundSpecimen is a 1.78g sliceCOMBINED SHIPPING : 5 per package Blue Ground : In reconnaissance for diamond mining, blue ground refers to a layer of non-oxidized kimberlite. Before the advent of modern geophysical probes, the ideal way to find a kimberlite pipe was to search for "yellow ground", a layer of oxidized kimberlite which is a deep tawny yellow. "Blue ground" was regarded with scorn during the South Afri...can diamond rushes. The geochemistry of Kimberlites is defined by the following parameters :Ultramafic MgO gt1225 and generally gt1525Ultrapotassic Molar K2OAl2O3 gt3Near-primitive Ni (gt400 ppm), Cr (gt1000 ppm), Co (gt150 ppm)REE-enrichmentModerate to high large ion lithophile element (LILE) enrichment SLILE gt1, 000 ppmHigh H2O and CO2 Kimberlite is an igneous rock best known for sometimes containing diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush, eventually creating the Big Hole.Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes as well as igneous dykes and sills. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between 150 and 450 kilometres, potentially from anomalously enriched in exotic mantle compositions (diamonds and garnet peridotite mantle xenoliths), and they are erupted rapidly and violently, often with considerable carbon dioxide and other volatile components. It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important. In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between the cratonic continental lithosphere and the underlying convecting asthenospheric mantle. Check out my other itemsWE COMBINE SHIPPINGPayment and ShippingI combine shipping, means you will pay only one time the S H fees regardless the quantity in the package. Usualy you will pay a total of 2 for all your items put together in one, or two packages.I accept Paypal or bank to bank transfer.If you have any question, please contact me.
You are viewing a specimen of Yellow Diamond Crystal from:Cullinan mine (Premier Mine), Cullinan, Pretoria District (Tshwane District), Gauteng, South Africa4.6 grams. (Total includes box bottom wo lid) .4 x .3cmThis specimen comes out of the Ron Lupocollection who has collected specimens from all around the world from the70's-presentAll specimens come with any original labels plus a label from my business. Great addition to any collectionI do ship worldwide. Shipping and Handling for outside th...e United States will be calculated above
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