
Stannite
ID: 107
Stannite
Chemical Formula
Cu₂FeSnS₄
Hardness (Mohs)
4
Crystal System
Tetragonal
Streak
Black
Luster
Metallic
Diaphaneity
Opaque
Color
Steel-gray to iron-black
Crystal Habit / Mode of Occurrence
Massive, granular
Density
4.3–4.5
Fun Facts
Stannite is sometimes called "bell metal ore" because it contains both copper and tin, key ingredients in bronze (used in bells). Although it's a minor tin ore, its attractive metallic luster and complex chemistry make it a favorite among mineral collectors. It is a sulfide mineral and is brittle.