South Africa
0.81 carats
© Mineral Classics
General Information | ||||||||||||||
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Chemical Formula |
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Photos of natural/un-cut material from mindat.org | ||||||||||||||
Physical Properties of Poldervaartite | ||||||||||||||
Mohs Hardness | 5Handbook of Mineralogy (2001) , | |||||||||||||
Specific Gravity | 2.91Handbook of Mineralogy (2001) , | |||||||||||||
Tenacity | BrittleHandbook of Mineralogy (2001) , Very brittle | |||||||||||||
Optical Properties of Poldervaartite | ||||||||||||||
Refractive Index | 1.634 to 1.656Handbook of Mineralogy (2001) , | |||||||||||||
Optical Character | Biaxial/+Handbook of Mineralogy (2001) , | |||||||||||||
Pleochroism | Weak: colorless - light gray - bluish grayHandbook of Mineralogy (2001) , | |||||||||||||
Dispersion | WeakHandbook of Mineralogy (2001) , | |||||||||||||
Colour | ||||||||||||||
Colour (General) | Colorless to whiteHandbook of Mineralogy (2001) , | |||||||||||||
Transparency | Transparent,TranslucentHandbook of Mineralogy (2001) , | |||||||||||||
Lustre | VitreousHandbook of Mineralogy (2001) , Vitreous on fractures to subvitreous on crystal faces | |||||||||||||
Fluorescence & other light emissions | ||||||||||||||
Fluorescence (Short Wave UV) | Fluoresces deep red under SWHandbook of Mineralogy (2001) , | |||||||||||||
Crystallography of Poldervaartite | ||||||||||||||
Crystal System | OrthorhombicHandbook 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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