Stannite
Mineral Cu2FeSnS4
Also called Bell-metal ore and Tin pyrites
About it
Steel grey tin sulfide with an olive tint, usually massive with chalcopyrite and sphalerite in tin veins. Known from Cornwall and the tin mines of Bolivia.
- Type
- Mineral
- Group
- Sulfide, stannite group
- Formula
- Cu2FeSnS4
- Hardness (Mohs)
- 3.5–4
- Specific gravity
- 4.3–4.5
- Streak
- black
- Lustre
- metallic
- Crystal system
- Tetragonal
- Colours
- steel grey, iron black, olive green tint
- Transparency
- opaque
- Cleavage and fracture
- indistinct; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.