dioptase
dioptase A rare mineral, formula CuSiO2(OH)2; sp.gr.3.3; hardness 5; trigonal; emerald-green, transparent to translucent; vitreous lustre; crystals usually short, prismatic, and terminated by rhombohedra, but also occurs massive; cleavage perfect rhombohedral; occurs in the oxidized zone of copper-sulphide deposits.
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Chrysoberyl , chrysoberyl Mineral, BeAl2O4; sp. gr. 3.5–3.8; hardness 8.5; orthorhombic; various shades of green or greenish-yellow; white streak; vitreous lustre;… Anglesite , wulfenite Mineral, PbMoO4; sp. gr. 6.5–7.0; hardness 3; tetragonal; orange-yellow, olive-green, or brown; white streak; resinous lustre; crystals usu… pentlandite , pentlandite An iron and nickel sulphide, with the formula (FeNi)9S8, and the main ore mineral for nickel; sp. gr. 4.5–5.0; hardness 3–4; cubic; light… Talc , talc A member of the 2:1 phyllosilicates (sheet silicates) with composition Mg6[Si4O10]2(OH)4; sp. gr. 2.58–2.83; hardness 1 (it has the lowest hardn… scheelite , scheelite Mineral, CaWO4; sp. gr. 5.9–6.1; hardness 4.5–5.0; tetragonal; white, or sometimes shades of yellow, green, brown, or red; white streak; vi… Uraninite , uraninite (pitchblende) Mineral, UO2; sp. gr. from 8.5 when massive to 10 for unaltered crystals; hardness 5–6; cubic; it is brownish-black or grey-b…
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dioptase