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Corundum is not uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare Gem corundum deposits are classified as primary and secondary deposits Primary deposits contain corundum either in the rocks where it crystallized or as xenocrysts and xenoliths carried by magmas to the Earth’s surface Classifiion systems for corundum deposits are based on

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Dolomite The mineral dolomite information

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201511 1 Introduction Kierlites alkali basalts and lamprophyres are important conveyors of gems especially for diamond and corundum from the asthenosphere and/or lower lithosphere to the upper crust Giuliani et al 2014 Shirey et al 2013These magmas carry xenoliths of mantle harzburgite lherzolite and websterite and in some localities eclogite but also xenoliths

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This a 2007 version of a Study Guide the UNISA Philosophy Dept has used to introduce to students since 2007 It is intended to be used with a textbook it was written for published in 2002 under Oxford University Press as Philosophy from Africa A


Corundum has two primary gem varieties ruby and sapphire Because of corundums hardness pure corundum is defined to have 90 on the Mohs scale it can scratch almost every other mineral 1 by the French chemist Auguste Verneuil

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etracy11037 2021 SSSS Rocks and Minerals Notes

20211120 1 etracy11037 2021 SSSS Rocks and Minerals Notes Table of Contents Ulexite 4 Azurite 5 Malachite 6 Aragonite 7 Calcite 8 Dolomite 9 Halite 10 Fluorite 11 Magnetite 12 Bauxite 13 Corundum 14 Hematite 15 Goethite/Limonite 16 Diamond 17 Copper 18 Silver 19 Gold 21 Sulfur 22 Graphite 23 Apatite 24 Sodalite 25 Talc 26 Epidote 27 Olivine 28 Topaz 29 Staurolite


200719 The fury of hellbent destructive white men when they have been falsely told by debauched negrophile white women It was a black man that raped me! These mythical words have left in their wake lynchings murders jailhouse hangings beatings and destructions of whole black towns The rape of white women is a myth

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