Kimberlite Pipes
Diamonds form at a depth greater than 93 miles (150 kilometers) beneath the earth's surface. After their formation, diamonds are carried to the surface of the earth by volcanic activity.
kimberlite: an igneous rock of mantle origin occurring in intrusive breccia pipes, which is sometimes diamond bearing.
mantle: the ultramafic layer of the earth beneath the crust.
Kimberlite Rock
The yellow or blue rock which forms diamond pipes, and in which most diamond is found.
Knot ...
kimberlite pipe See pipe.
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kimberlite The igneous rock that most rough diamond is found in. Also commonly called blue ground.
Kimberlite
Kimberlite is a mica peridotite and a source of rich deposits of diamonds. The deposits occurring at Kimberley, South Africa were the first recognized and the source of the name.
Kimberlite diatremes are known on virtually every continent but most do not produce diamonds.
Kimberlite
A rare form of igneous rock that may host diamonds in primary deposits. Have high contents of volatile elements.
Knife edge girdle ...
Kimberlite
The yellow or blue "ground" rock which forms diamond "pipes", and in which most diamond is found.
Kings ...
K: karat, kimberlite, Kunzite, kyanite
L: labradorescence, lamproite, lapidary, lapis lazuli, Larimar, lepidocrosite, limonite, lithification, loupe ...
The magma in volcanic pipes is usually one of two characteristic types, which cool into igneous rock known as either kimberlite or lamproite.
It is also found in kimberlites " unusual intrusive rocks that contain diamonds. While most minerals have just one hardness, kyanite has a range of 4.5-6.
Kyanite is also found in eclogites in kimberlite pipes. Flattened and elongated prisms of kyanite have been recovered from pegmatites, schists, and gneiss deposits all over the globe. The schists of St.
Spring 1949, Kimberlite found in the Bakanga diamond field, Zaire, p. 131, 5pp
Fall 1949, Diamond Mining in South Africa, p. 216, 4pp.
Fall 1950, New diamond discovery from the Gold Coast, p. 349, 1p.
Diamond exploration in Canada began in the 1960s, but major discoveries of diamond-bearing kimberlite ore did not occur until the 1990s.
Basic igneous rocks (BIR) include basalts, dolerites, gabbros, kimberlites, and peridotites, and abundant minerals in such rocks include olivine, pyroxenes, Ca-feldspar (plagioclase), amphiboles, and biotite.
Powerful volcanic activity formed what are known as "pipes" - openings in the earth - and forced the diamonds up through the pipes to the surface, along with other minerals such as kimberlite.
A miner's nickname for 'kimberlite,' the rock that contains diamonds in the South African pipe mines.
Body Color The color of a diamond as observed when examined under a diffused light against a hueless background free from surrounding reflections.
Diamonds are formed about 170 to 200 kms below the surface of the earth and reaches the earth's surface through volcanic eruptions in kimberlite stones.
Diamonds are mined from the hardened lava "Diamond Pipes" and removed from the surrounding rock, which is called "Kimberlite". The process of panning and digging river beds is known as alluvial mining.
The collision of the two continental plates also triggered volcanic activity that created igneous rock known as kimberlite, which is capable of yielding diamonds.
They are mined from kimberlite and lamproite volcanic pipes, which brought to the surface the Diamond crystals from deep in the Earth where the high pressure and temperature enables the formation of the crystals.
Alkaline Rocks, Carbonatites and Kimberlites, introduction to alkaline rocks and their characteristics, also a brief page on mont Saint-Hilaire and other alkaline localities. Dr. A. R. Chakhmouradian ...
Canada Diamond prospecting started in Canada in the 1960's or earlier, kimberlite was found in the 1990's, and the first commercial mine opened in 1991.
Murfreesboro: Arkansas town in Pike County near the largest diamond bearing kimberlite pipe in the united States. The Crater of Diamonds State Park is 2 1/2 miles south of Murfreesboro where visitors (for a small fee) can search for diamonds.
Blueground - A miner's nickname for kimberlite, the rock that contains diamonds in the South African pipe mines.
Occurrence: Diablo Canyon or Meteor Crater in Arizona and as a trace in several kimberlite deposits and Placer deposits eroded from them.
Moissanite
Physical Properties ...
Once diamonds have been mined and processed out of the 'overburden' (that is, the kimberlite rocks in which they are imbedded), the rough crystals are sorted and categorized according to their size, color, shape and other characteristics.
scapolite, diopside, calcite, wollastonite, kimberlite, tremolite
Locals:
Misc: ...
In Tay Nguyen (Kon Tum province), kimberlite dykes are discovered and the rocks are made of olivine, phlogopite, garnet, pyrope and perovskite.
Occurrence
Arizona, South Africa, Argentina, Australia, Brazil, Myanmar (Burma), Scotland, Switzerland and Tanzania. Often found in the presence of diamond bearing rock (kimberlite).
Large pebbles of garnet found on the ground in the Kalahari desert led to discovery of diamond mines. Also in Russia, the discovery of pyrope garnet in 1953 instigated a search for diamonds where the first kimberlite pipe (diamonds) was located in ...
As one would predict, a truly colorless stone will carry a premium price, and the larger that diamond, the greater the premium per carat. For every carat of polished gem quality diamond, about 250 tons of diamond-bearing earth (kimberlite) must be ...
 See also: Diamond, Stone, Color, Mineral, Rough
  
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