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The Mineral metastibnite

Red Metastibnite Crusts

Red, reddish-brown, purplish-red, reddish gray, silver-gray

Amorphous

Streak
Red

Hardness
2 - 3

Transparency
Translucent to opaque

Specific Gravity
4.5

Luster
Metallic, dull

Cleavage
None

Fracture
Earthy

Tenacity
Brittle

Composition

In Group
Sulfides; Simple Sulfides

Striking Features
Formation habits, localities, and mode of occurrence

Sulfur, Stibnite, Pyrite