Lepidocrocite
Mineral FeO(OH)
About it
Red to red-brown scaly plates and feathery tufts with a dull orange streak, redder and flakier than goethite, its polymorph. The red flecks in 'lepidocrocite quartz' from Brazil and Madagascar are often hematite instead.
- Type
- Mineral
- Group
- Hydroxide, boehmite group
- Formula
- FeO(OH)
- Hardness (Mohs)
- 5
- Specific gravity
- 4–4.13
- Streak
- dull orange
- Lustre
- submetallic, adamantine (diamond-like), silky
- Crystal system
- Orthorhombic
- Colours
- red, reddish brown, blackish red
- Transparency
- translucent, opaque
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.