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different gems mined in south africa

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Tanzanite: What you need to know about color, rarity, value

Natural blue tanzanite: The pair of crystals shown on the left is the same pair of crystals shown on the right They have different apparent colors because tanzanite is pleochroic - it appears to be different colors when viewed from different directions...

Spilpunt: South Africa

Apr 15, 2007· South Africa is one of the world's and Africa's most important mining countries in terms of the variety and quantity of minerals produced that include gold, chromium, antimony, coal, iron ore, manganese, nickel, phosphates, tin, uranium, diamonds, platinum, copper, vanadium, salt ,...

Peridot Gemstones: Buy Peridot Gemstones at Wholesale Prices

Peridot Peridot belongs to the forsterite-fayalite mineral series which is part of the olivine group It is one of the "idiochromatic" gems, meaning its color comes from the basic chemical composition of the mineral itself, not from minor impurities, and therefore will only be found in shades of green...

Birthstone Colors - Chart of all birthstone colors by month

What are birthstones? Your birthstone color determined by the month you were born in Most birthstones by definition are gems, however, all of them are minerals...

Recent Advances in Understanding the Geology of Diamonds ,

Gems & Gemology Gems & Gemology, Winter 2013, Vol 49, No 4 Recent Advances in Understanding the Geology of Diamonds Steven B Shirey and James E Shigley...

Gemstone Supplier Nelspruit | Semi-Precious Stones ,

VA Blue Gems Trading is a Southern African gemstone supplier specialising in tumbled semi-precious stones; buy online...

Diamond - Wikipedia

Diamond is a solid form of pure carbon with its atoms arranged in a crystal Solid carbon comes in different forms known as allotropes depending on the type of chemical bond The two most common allotropes of pure carbon are diamond and graphiteIn graphite the bonds are sp 2 orbital hybrids and the atoms form in planes with each bound to three nearest neighbors 120 degrees apart...

Ruby and Sapphire: Gems of the Mineral Corundum - Geology

Ruby, Sapphire, and Fancy Sapphire Most people don't realize that ruby and sapphire are both gems of the mineral corundumBoth of these gemstones have the same chemical composition and the same mineral structure Trace amounts of impurities determine if a gem corundum will be a brilliant red ruby or a beautiful blue sapphire...