| Attributes | Values |
|---|
| rdf:type
| |
| rdfs:label
| |
| rdfs:comment
| - 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. It was first described in 1954 for an occurrence at the La Sal No. 2 Mine, Beaver Mesa, Mesa County, Colorado, USA, and named for American geologist Reuben Clare Coffin (1886-1972). It has widespread global occurrence in Colorado Plateau-type uranium ore deposits of uranium and vanadium. It replaces organic matter in sandstone and in hydrothermal vein type deposits. It occurs in association with uraninite, thorite, pyrite, marcasite, roscoelite, clay minerals and amorphous organic matter.
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| sameAs
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| dcterms:subject
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| dbkwik:ceramica/pr...iPageUsesTemplate
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| Category
| |
| opticalprop
| |
| mohs
| |
| Other
| |
| Gravity
| |
| dbkwik:resource/kgTDlFQssXOgXNBukZKEew==
| |
| Name
| |
| symmetry
| - Tetragonal 4/m 2/m 2/m ditetragonal dipyramidal
|
| Caption
| - Pitchblende and coffinite in a sample from a Czech mine
|
| streak
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| formula
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| System
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| pleochroism
| - Moderate; pale yellow-brown parallel to and medium brown perpendicular to long axis
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| Color
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| unit cell
| - a = 6.97 Å, c = 6.25 Å; Z = 3
|
| tenacity
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| habit
| - Rarely as crystals, commonly as colloform to botryoidal incrustations, fibrous, pulverulent masses
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| diaphaneity
| - Opaque, transparent on thin edges
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| fracture
| - Irregular to subconchoidal
|
| refractive
| - nα = 1.730 - 1.750 nβ = 1.730 - 1.750
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| luster
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| birefringence
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| abstract
| - 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. It was first described in 1954 for an occurrence at the La Sal No. 2 Mine, Beaver Mesa, Mesa County, Colorado, USA, and named for American geologist Reuben Clare Coffin (1886-1972). It has widespread global occurrence in Colorado Plateau-type uranium ore deposits of uranium and vanadium. It replaces organic matter in sandstone and in hydrothermal vein type deposits. It occurs in association with uraninite, thorite, pyrite, marcasite, roscoelite, clay minerals and amorphous organic matter.
|
![[RDF Data]](/fct/images/sw-rdf-blue.png)