Chemical Formula

MgCO₃

Hardness (Mohs)

3.5 - 4.5

Crystal System

Trigonal

Streak

White

Luster

Vitreous, pearly, or dull and earthy

Diaphaneity

Translucent to Opaque

Color

Typically white, but can also be gray, yellowish, brownish, or light pink. Often has darker veining.

Crystal Habit / Mode of Occurrence

Usually massive, granular, earthy, or fibrous. Less commonly found as small rhombohedral crystals.