Friedelite
Franklin, Franklin Mining District, Sussex County, New Jersey, USA
3.40 carats
© Rarestone.com
Friedelite 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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Friedelite Gemstones by Size
This table shows distribution of Friedelite 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:3.40 cts
Heaviest:9.97 cts
Average:6.69 cts
Total photos:2
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| General Information | ||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Friedelite | ||||||||||||||||||
| Mohs Hardness | 4 to 5, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Specific Gravity | 3.04 to 3.19, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Fracture | Uneven, Gemstones (2009) Tough | |||||||||||||||||
| Optical Properties of Friedelite | ||||||||||||||||||
| Refractive Index | 1.627 to 1.663, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Optical Character | Uniaxial/-, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Birefringence | 0.032 to 0.035, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Pleochroism | Nil, Gemstones (2009) | |||||||||||||||||
| Dispersion | Nil, Gemstones (2009) | |||||||||||||||||
| Colour | ||||||||||||||||||
| Colour (General) | Pink, red, brown, yellow, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Transparency | Translucent,Opaque, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Lustre | Vitreous, Gemstones (2009) | |||||||||||||||||
| Fluorescence & other light emissions | ||||||||||||||||||
| Fluorescence (General) | Reddish, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Fluorescence (Short Wave UV) | Some specimens have shown green fluorescence, Gems, Sixth Edition (2006) | |||||||||||||||||
| Fluorescence (Long-Wave UV) | Some specimens have shown yellow fluorescence, Gems, Sixth Edition (2006) | |||||||||||||||||
| Crystallography of Friedelite | ||||||||||||||||||
| Crystal System | Trigonal, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Habit | Pseudohexagonal tablets, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Geological Environment | ||||||||||||||||||
| Where found: | Occur in metamorphosed manganese–iron deposits, Gems, Sixth Edition (2006) | |||||||||||||||||
| Further Information | ||||||||||||||||||
| Mineral information: | Friedelite information at mindat.org | |||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||
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