Biotite
At a glance
- Type
- Mineral
- Group
- Silicate
- Crystal system
- Monoclinic
- Hardness
- Soft (Mohs under 3)
- Colour
- Black, Brown
- Lustre
- Glassy, Pearly
- Use
- No special use
- Difficulty in WildGuessr
- Medium
Did you know?
- Biotite is named after the French physicist Jean-Baptiste Biot, who studied the optical properties of mica.
- Because biotite contains potassium, it can be used to date rocks by radioactive decay.
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Classification, names and conservation status come from Wikidata (CC0), the photo from Wikimedia Commons. Wikidata Q105794 · All stones · All entries