About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 56. Chapters: Ruby, Corundum, Uraninite, Hematite, Sapphire, Limonite, Rutile, Coltan, Anatase, Columbite, Ilmenite, Pyrochlore, Baddeleyite, Euxenite, Manganese dioxide, Strontium titanate, Armalcolite, Cement chemist notation, Thorianite, Lead tetroxide, Schreyerite, Zemannite, Changbaiite, Lodestone, Mendipite, Wustite, Cassiterite, Cleusonite, Kermesite, Perovskite, Cuprite, Psilomelane, Valentinite, Pyrolusite, Studtite, Scrutinyite, Plattnerite, Lime, Samarskite, Kamiokite, Bixbyite, Loveringite, Tantalite, Maghemite, Emmonsite, Periclase, Akhtenskite, Umber, Rameauite, Tenorite, Zincite, Loparite-(Ce), Microlite, Emery, Wodginite, Simpsonite, Powellite, Fergusonite, Grossite, Schoepite, Ordonezite, Hibonite, Walfordite, Betafite, Brookite, Romanechite, Schwertmannite, Kassite, Curite, Massicot, Bismite, Manganosite, Seeligerite, Masuyite, Tellurite, Stibiconite, Romeite, Ferropericlase, Haggertyite, Murdochite, Litharge, Claudetite, Tapiolite, Akdalaite, Melaconite, Hydrokenoelsmoreite, Zirkelite, Cleveite, Sabinaite, Cafetite, Tantite, Terlinguaite, Akaganeite, Titanowodginite, Polycrase, Todorokite, Ceylonite, Manganese oxide, Nsutite, Zimbabweite, Rynersonite, Akimotoite, Zirconolite, Leucoxene, Wad, Brownmillerite, Kadyrelite, Argutite. Excerpt: Sapphire (Greek: sappheiros, "blue stone") is a gemstone variety of the mineral corundum, an aluminium oxide ( -Al2O3), when it is a color other than red or dark pink; in which case the gem would instead be called a ruby, considered to be a different gemstone. Trace amounts of other elements such as iron, titanium, or chromium can give corundum blue, yellow, pink, purple, orange, or greenish color. Pink-orange sapphires are also called padparadscha. Pure chromium is the distinct impurity of rubies. However, a combination of e.g. chromium and titanium can give a sapphire a col...
