coffinite

Coffinite 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

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Wikidata facts

Image: Blenda smolista + coffinit.jpg

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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
IMA Mineral Symbol: Cof
chemical formula: U(SiO₄) * nH₂O
Strunz 8th edition (series ID, updated): VIII/A.07

Sources (1)

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Article

6 sections

Contents

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.