A rare earth oxide mineral, also containing uranium. This mineral is radioactive.
A uranium bearing, rare hydrous silicate mineral found in metamorphic rocks.
Chrysoprase is a green variety of chalcedony. Its green color comes from nickel silicate inclusions (commonly willemseite or related Ni minerals), not from chromium or vanadium like in emerald.
Dioptase is an intense emerald-green to bluish-green mineral that is cyclosilicate of copper.
Dolomite is widely known for its distinct crystal habit, chemical properties, and geological importance.
