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
Wikidata facts
- Image
- Blenda smolista + coffinit.jpg
Show 7 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.AD.30
- Commons category
- Coffinite
- Nickel-Strunz 9th edition (updated 2009)
- 9.AD.30
- crystal system
- tetragonal crystal system
- IMA Mineral Symbol
- Cof
- chemical formula
- U(SiO₄) * nH₂O
- Strunz 8th edition (series ID, updated)
- VIII/A.07
Sources (1)
via Wikidata · CC0
~6 min read
Encyclopedic overview
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.
Excerpted from Wikipedia’s “coffinite” article, available under the CC BY-SA 4.0 licence.