Bismuth
This mineral forms indistinct crystals, which are often twinned. Habits are usually massive, foliated, dendritic, reticulated, lamellar, and granular.
It is silvery white, with a reddish or iridescent tarnish. The streak is silvery white. Bismuth is opaque, with a metallic luster.
FORMATION Forms in hydrothermal veins and pegmatites.
TESTS Fuses at low temperatures and dissolves easily in nitric acid.
Group: NATIVE ELEMENTS
Composition: Bi
Hardness: 2–2½
SG: 9.70–9.83
Cleavage: Perfect basal
Fracture: Uneven
