Pseudobrookite
Mineral Fe2TiO5
About it
Thin, shiny black to dark brown prisms and blades in cavities of rhyolite and andesite. Named for its likeness to brookite; Utah's Thomas Range and the Eifel volcanoes of Germany give fine crystals.
- Type
- Mineral
- Group
- Oxide, pseudobrookite group
- Formula
- Fe2TiO5
- Hardness (Mohs)
- 6
- Specific gravity
- 4.33–4.4
- Streak
- reddish brown
- Lustre
- adamantine (diamond-like), submetallic, metallic
- Crystal system
- Orthorhombic
- Colours
- black, dark brown, reddish brown
- Transparency
- opaque, translucent
- Cleavage and fracture
- poor in one direction; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.