covellite
covellite Mineral, CuS; sp. gr. 4.6; hardness 2; dark blue; sub-metallic lustre, may show an iridescent tarnish; found massive or in thin plates; occurs in the zone of secondary enrichment overlying 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… Azurite , azurite Secondary mineral, Cu3(CO3)2(OH)2; sp. gr. 3.7–3.9; hardness 3.5–4.0; monoclinic; various shades of deep azure blue; light-blue streak; vitre… Speculum , speculum •amalgam • Targum • begum •Brigham • lingam • ogham • sorghum •Nahum • Belgium • dodgem •Brummagem • stratagem • Rackham •Malcolm • Ascham •… 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… Metallic , me·tal·lic / məˈtalik/ • adj. of, relating to, or resembling metal or metals: metallic alloys a curious metallic taste. ∎ (of sound) resembling that… Chalcopyrite , chalcopyrite
chalcopyrite (copper pyrites) Most common copper mineral, CuFeS2; sp. gr. 4.1–4.3; hardness 3.5–4.0; tetragonal; brass-yellow, often wit…
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covellite