gilsonite
gilsonite (asphaltite) Solid form of hydrocarbon which occurs as pure, natural bitumen; sp. gr. 1.05–1.10; hardness 2; black; occurs in veins, lodes, and sedimentary rocks. On heating it softens rapidly and flows like a liquid. It is used in waterproof coatings, wire insulations, and lacquer.
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wolframite , wolframite Ore mineral for tungsten, with the formula (Fe,Mn)WO4; sp. gr. 7.0–7.5; hardness 5.0–5.5; monoclinic; grey-black to brownish-black; browni… Bitumen , BITUMEN
BITUMEN (Heb. חֵמָר, hemar and כֹּפֶר, kofer; lxx), a black, flammable substance which becomes viscous and absorbent on heating. It occurs in… Titanite , sphene (titanite) A nesosilicate CaTiSiO4 (O,OH,F); sp. gr. 3.45–3.55; hardness 5; crystals wedge-shaped, occasionally massive; brown, grey, reddish… 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… Leucite , leucite An important feldspathoid mineral KA1Si2O6; sp.gr.2.5; hardness 5.5–6.0; tetragonal; normally white or grey; vitreous lustre; crystals form v… Biotite , biotite
biotite An important rock-forming silicate mineral; a member of the mica group K2(Mg,Fe)6[Si3AlO10]2(OH,F)4, in which the Mg/Fe ratio is less…
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gilsonite