Chemical Formula

FeAsS

Hardness (Mohs)

5.5 - 6

Crystal System

Monoclinic

Streak

Black

Luster

Metallic

Diaphaneity

Opaque

Color

Silver-white, grayish black

Crystal Habit / Mode of Occurrence

Typically prismatic crystals, often striated parallel to the prism axis. Also common as granular, massive, and sometimes columnar aggregates. Twinning is frequent, which can result in pseudo-orthorhombic shapes.