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; brownish black streak; metallic lustre; crystals normally tabular, prismatic, often bladed, also occurs granular and massive; cleavage perfect quartz; occurs in high-temperature hydrothermal veins, quartz veins, and pegmatites, associated with granitic rocks, with cassiterite, arsenopyrite, tourmaline, scheelite, galena, sphalerite, and quartz.
arsenopyrite
arsenopyrite (known historically as mispickel) Mineral, FeAsS; sp. gr. 5.9–6.2; hardness 5.5–6.0; monoclinic; silver-grey to white, often with a tarnish; dark greyish or black streak; metallic lustre; crystals prismatic, often striated, can also be massive and granular; cleavage distinct {101}; occurs in high- to moderate-temperature mineral veins in association with gold, ores of tin, tungsten, galena, and quartz, and also disseminated in limestones, dolomites, gneisses, and pegmatites. It is the principal source of arsenic compounds used for pest control, for the manufacture of dyes and chemicals, and in leather treatment.
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Cassiterite , cassiterite (tinstone) Mineral, SnO2; sp. gr. 6.8–7.1; hardness 6–7; tetragonal; usually reddish-brown to nearly black, but it can be yellowish and r… 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… Precious Metals , Gold, silver, and platinum have historically been valued for their beauty and rarity. They are the precious metals . Platinum usually costs slightly… cobaltite , cobaltite (cobalt glance) Mineral, CoAsS; sp. gr. 6.0–6.5; hardness 5–6; cubic; from white to dark grey or greyish-black, all with a reddish tinge; g… Damascening , Damascene-work. Designs incised into metal and filled with gold, silver, or copper, often of the arabesque type. manganite , manganite Mineral, MnO2Mn(OH)2; sp. gr. 4.2–4.4; hardness 3–4; monoclinic; dark steel-grey to black; reddish-brown to black streak; sub-metallic lust…
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arsenopyrite
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arsenopyrite