enargite
enargite A sulphide mineral Cu3AsS4 and end-member of an isomorphous series, the other end-member being famatinite Cu3SbS4; sp. gr. 4.5; hardness 3; greyish-black; metallic lustre; occurs as irregular grains in association with other sulphides in copper-rich mineral deposits.
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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… 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… Stibnite , stibnite (antimonite, antimony glance) One of the main ore minerals for antimony, with the formula Sb2S3; sp. gr. 4.6; hardness 2.0–2.5; orthorhombic… Sphalerite , sphalerite (black jack, zinc blende) Mineral, ZnS; sp. gr. 3.9–4.1; hardness 3.5–4.0; cubic; colour variable, but commonly yellow, brown, or black, a… Metallic , me·tal·lic / məˈtalik/ • adj. of, relating to, or resembling metal or metals: metallic alloys a curious metallic taste. ∎ (of sound) resembling that… 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…
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enargite