digenite
digenite A copper sulphide Cu9S5, closely related to chalcocite Cu2S; sp. gr. 5.7; hardness 3; greyish-blue; sub-metallic lustre; occurs as irregular aggregates in association with other copper sulphides, e.g. chalcopyrite and bornite, in mineral deposits.
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Pyrrhotite , pyrrhotite Mineral, FeS; sp. gr. 4.6–4.7; hardness 3.5–4.5; hexagonal; bronzeyellow but darkens rapidly to reddishbrown on exposure; greyish-black st… Triangle (music) , triangle. Perc. instr. of indefinite pitch, made of metal shaped into a triangle and struck with metal stick to give tinkling sound. Much used by com… ilmenite , ilmenite Mineral, FeTiO3; sp. gr. 4.5–5.0; hardness 5–6; trigonal; black; black to brownish-red streak; sub-metallic lustre; crystals normally thick… 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… Metals , Metals
Metals are rarely encountered in their elemental state in nature. They must first be extracted from the ground as an ore, which is then treate… Alum , alum (ăl´əm), any one of a series of isomorphous double salts that are hydrated sulfates of a univalent cation (e.g., potassium, sodium, ammonium, ce…
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digenite