New Jersey, USA
1.29 carats
© Rarestone.com
General Information | ||||||||||||||||||
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Chemical Formula |
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Physical Properties of Friedelite | ||||||||||||||||||
Mohs Hardness | 4 to 5Gemmological Tables (2004) , More from other references | |||||||||||||||||
Specific Gravity | 3.06 to 3.19Gemstones of the world (2001) , More from other references | |||||||||||||||||
Cleavage Quality | PerfectGemmological Tables (2004) , More from other references | |||||||||||||||||
Fracture | UnevenGemstones (2009) , Tough | |||||||||||||||||
Optical Properties of Friedelite | ||||||||||||||||||
Refractive Index | 1.627 to 1.663Gemmological Tables (2004) , More from other references | |||||||||||||||||
Optical Character | Uniaxial/-Gemmological Tables (2004) , More from other references | |||||||||||||||||
Birefringence | 0.032 to 0.035Gemmological Tables (2004) , More from other references | |||||||||||||||||
Pleochroism | NilGemstones (2009) , | |||||||||||||||||
Dispersion | NilGemstones (2009) , | |||||||||||||||||
Colour | ||||||||||||||||||
Colour (General) | Pink, red, brown, yellowGemmological Tables (2004) , More from other references | |||||||||||||||||
Transparency | Translucent,OpaqueGemmological Tables (2004) , More from other references | |||||||||||||||||
Lustre | VitreousGemstones (2009) , | |||||||||||||||||
Fluorescence & other light emissions | ||||||||||||||||||
Fluorescence (General) | ReddishGemmological Tables (2004) , More from other references | |||||||||||||||||
Fluorescence (Short Wave UV) | Some specimens have shown green fluorescenceGems, Sixth Edition (2006) , | |||||||||||||||||
Fluorescence (Long-Wave UV) | Some specimens have shown yellow fluorescenceGems, Sixth Edition (2006) , | |||||||||||||||||
Crystallography of Friedelite | ||||||||||||||||||
Crystal System | MonoclinicGemstones of the world (2001) , Pseudo-trigonalMore from other references | |||||||||||||||||
Habit | Pseudohexagonal tabletsGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Geological Environment | ||||||||||||||||||
Where found: | Occur in metamorphosed manganese–iron depositsGems, Sixth Edition (2006) , | |||||||||||||||||
Further Information | ||||||||||||||||||
Mineral information: | Friedelite information at mindat.org | |||||||||||||||||
Significant Gem Localities | ||||||||||||||||||
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