Brannerite
Mineral UTi2O6
Take care.
- Radioactive: Keep it in a closed, labelled box away from where people sit or sleep, handle it briefly, wash your hands after, and never grind or cut it.
About it
Black to brown prismatic crystals and grains with a resinous lustre, strongly radioactive, in pegmatites and uranium deposits. A uranium ore at Elliot Lake, Ontario; named for American geologist John Casper Branner.
- Type
- Mineral
- Group
- Oxide, brannerite group
- Formula
- UTi2O6
- Hardness (Mohs)
- 4–5
- Specific gravity
- 4.5–6.4
- Streak
- dark greenish brown
- Lustre
- resinous, vitreous (glassy), adamantine (diamond-like)
- Crystal system
- Monoclinic
- Colours
- black, brown, olive green, yellow-brown
- Transparency
- opaque, translucent
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.