Poldervaartite
South Africa
0.81 carats
© Mineral Classics
Poldervaartite forms colourless, milky white, light orange-pink, pink-white prismatic crystals.
The material suitable for faceting is scarce.
Poldervaartite 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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Poldervaartite Gemstones by Size
This table shows distribution of Poldervaartite 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
Heaviest:0.81 cts
Average:0.81 cts
Total photos:2
Do you have a larger Poldervaartite? Why not upload a photo?
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| General Information | ||||||||||||||
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| Chemical Formula |
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| Photos of natural/un-cut material from mindat.org | ||||||||||||||
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| Physical Properties of Poldervaartite | ||||||||||||||
| Mohs Hardness | 5, Handbook of Mineralogy (2001) | |||||||||||||
| Specific Gravity | 2.91, Handbook of Mineralogy (2001) | |||||||||||||
| Tenacity | Brittle, Handbook of Mineralogy (2001) Very brittle | |||||||||||||
| Optical Properties of Poldervaartite | ||||||||||||||
| Refractive Index | 1.634 to 1.656, Handbook of Mineralogy (2001) | |||||||||||||
| Optical Character | Biaxial/+, Handbook of Mineralogy (2001) | |||||||||||||
| Pleochroism | Weak: colorless - light gray - bluish gray, Handbook of Mineralogy (2001) | |||||||||||||
| Dispersion | Weak, Handbook of Mineralogy (2001) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Colorless to white, Handbook of Mineralogy (2001) | |||||||||||||
| Transparency | Transparent,Translucent, Handbook of Mineralogy (2001) | |||||||||||||
| Lustre | Vitreous, Handbook of Mineralogy (2001) Vitreous on fractures to subvitreous on crystal faces | |||||||||||||
| Fluorescence & other light emissions | ||||||||||||||
| Fluorescence (Short Wave UV) | Fluoresces deep red under SW, Handbook of Mineralogy (2001) | |||||||||||||
| Crystallography of Poldervaartite | ||||||||||||||
| Crystal System | Orthorhombic, Handbook of Mineralogy (2001) | |||||||||||||
| Habit | Crystals are prismatic, to 7 mm; aggregates in sheaves., Handbook of Mineralogy (2001) | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | In a pocket in massive manganese ores in a bedded manganese ore deposit., Handbook of Mineralogy (2001) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Poldervaartite information at mindat.org | |||||||||||||
| Significant Gem Localities | ||||||||||||||
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