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Click on a letter above to view the list of gems. |
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Scheelite |
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| Chemistry: CaWO4 [Calcium Tungstate] | |
| Discovered
in 1821;
IMA
status: Valid (pre-IMA; Grandfathered). | ||
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Classification |
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Molybdates and Wolframates | |
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6 : Sulphates, Chromates, Molybdates |
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Crystal Data |
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Crystals are typically pseudo-octahedral, with modifying forms to 32 cm; commonly granular, massive. |
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Physical Properties |
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Distinct on [010] |
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Uneven |
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Brittle |
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4.5 - 5.0 |
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5.90 - 6.30 (g/cm3) |
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Not Radioactive |
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Optical Properties |
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Colorless, white, gray, brown, pale yellow, yellow-orange, pale shades of orange, red, green; may be color zoned. |
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Transparent, Translucent, Opaque |
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Vitreous to Adamantine |
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1.918 - 1.937 Uniaxial ( + ) |
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0.016 |
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0.038 |
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n/a |
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Occurances |
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Geological Setting: |
Typically a component of contact-metamorphic tactite; in high-temperature hydrothermal veins and greisen; less common in granite pegmatites and medium-temperature hydrothermal veins; alluvial. |
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Type Locality: |
Bispberg iron mine, Säter, Dalarna, Sweden |
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Year Discovered: |
1821 |
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View mineral photos: | |
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More Information |
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