Powellite
India
0.80 carats
© Rarestone.com
Powellite forms transparent to translucent colourless, straw yellow, greenish yellow, greenish blue or blue crystals with characteristically greasy or subadamantine lustre.
Facetable material is rare as crystals are usually small and seldom exceed 2 carats.
Powellite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Powellite Gemstones by Size
This table shows distribution of Powellite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.80 cts
Heaviest:5.09 cts
Average:2.06 cts
Total photos:4
Do you have a larger Powellite? Why not upload a photo?
| General Information | ||||||||||||||
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| Chemical Formula |
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| Physical Properties of Powellite | ||||||||||||||
| Mohs Hardness | 3.5 to 4, Gems, Sixth Edition (2006) | |||||||||||||
| Specific Gravity | 4.23, Gems, Sixth Edition (2006) Near 4.23 | |||||||||||||
| Cleavage Quality | Indistinct, Handbook of Mineralogy (2001) | |||||||||||||
| Fracture | Uneven, Handbook of Mineralogy (2001) | |||||||||||||
| Optical Properties of Powellite | ||||||||||||||
| Refractive Index | 1.974 to 1.984, Gems, Sixth Edition (2006) | |||||||||||||
| Optical Character | Uniaxial/+, Gems, Sixth Edition (2006) | |||||||||||||
| Pleochroism | In deeply colored specimens: blue - green, Handbook of Mineralogy (2001) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Straw yellow, greenish yellow, greenish blue or blue, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Transparency | Transparent,Translucent, Gems, Sixth Edition (2006) | |||||||||||||
| Lustre | Subadamantine,Greasy, Gems, Sixth Edition (2006) | |||||||||||||
| Fluorescence & other light emissions | ||||||||||||||
| Fluorescence (General) | Specimens may fluoresce yellowish white to golden yellow, Gems, Sixth Edition (2006) | |||||||||||||
| Fluorescence (Short Wave UV) | Fluoresces creamy white or yellow to golden yellow, Handbook of Mineralogy (2001) | |||||||||||||
| Crystallography of Powellite | ||||||||||||||
| Crystal System | Tetragonal, Gems, Sixth Edition (2006) | |||||||||||||
| Habit | Dipyramidal crystals, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | Powellite occurs as an uncommon secondary mineral in the oxidation zone of molybdenum-bearing hydrothermal mineral deposits., Gems, Sixth Edition (2006) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Powellite information at mindat.org | |||||||||||||
| Significant Gem Localities | ||||||||||||||
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