coffinite
Sign in to saveCoffinite is a uranium-bearing silicate mineral with formula: U(SiO4)1−x(OH)4x.
Key facts
- Mineral.imagesize
- 260px
- Mineral.name
- Coffinite
- Mineral.category
- Nesosilicate
- Mineral.boxbgcolor
- b46d4e
- Mineral.boxtextcolor
- fff
- Mineral.image
- Blenda smolista + coffinit.jpg
- Mineral.caption
- Pitchblende and coffinite in a sample from a Czech mine
- Mineral.formula
- U(SiO4)1−x(OH)4x
- Mineral.IMAsymbol
- Cof
- Mineral.strunz
- 9.AD.30
- Mineral.system
- Tetragonal
- Mineral.class
- Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m)
- Mineral.symmetry
- I41/amd
- Mineral.unit cell
- a = 6.97 Å, c = 6.25 Å; Z = 4
- Mineral.color
- Black (from organic inclusions; pale to dark brown in thin section
- Mineral.habit
- Rarely as crystals, commonly as colloform to botryoidal incrustations, fibrous, pulverulent masses
- Mineral.fracture
- Irregular to subconchoidal
- Mineral.tenacity
- Brittle to friable
via Wikipedia infobox
Article
6 sectionsContents
- Composition
- Crystal structure
- Physical properties
- Geological occurrence
- Special characteristics
- References
Coffinite is a uranium-bearing silicate mineral with formula: U(SiO4)1−x(OH)4x.
It occurs as black incrustations, dark to pale-brown in thin section. It has a grayish-black streak. It has a brittle to conchoidal fracture. The hardness of coffinite is between 5 and 6.