bournonite Sulphide mineral, CuPbSbS3; sp. gr. 6; hardness 3; grey; sub-metallic lustre; massive or rarely as cogwheel aggregates; occurs in hydrothermal veins associated with copper and lead mineralization.
More From encyclopedia.com
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… 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… 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… 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… Molybdenite , molybdenite Mineral, MoS2; sp. gr. 4.6–4.8; hardness 1.0–1.5; hexagonal; pale bluish to lead-grey; greenish-grey streak; metallic lustre; crystals he… Rare-earth Metals , rare-earth metals rare-earth metals rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like