Herderite 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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Herderite Gemstones by Size
This table shows distribution of Herderite 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:1.16 cts
Heaviest:5.43 cts
Average:2.64 cts
Total photos:9
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| General Information | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Formula |
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| Physical Properties of Herderite | |||||||||
| Mohs Hardness | 5 to 5.5, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Specific Gravity | 2.90 to 3.02, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Cleavage Quality | Indistinct, Gemstones (2009) | ||||||||
| Fracture | Sub-Conchoidal, Gemstones (2009) | ||||||||
| Optical Properties of Herderite | |||||||||
| Refractive Index | 1.587 to 1.642, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Optical Character | Biaxial/+,-, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Birefringence | 0.028 to 0.032, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Dispersion | Nil, Gemstones (2009) | ||||||||
| Colour | |||||||||
| Colour (General) | Yellow, yellow-brown, brown, Gemmological Tables (2004) More from other references | ||||||||
| Transparency | Transparent, Gemmological Tables (2004) More from other references | ||||||||
| Lustre | Vitreous, Gemstones (2009) | ||||||||
| Fluorescence & other light emissions | |||||||||
| Fluorescence (General) | Commonly greenish to violet, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Phosphorescence | Some specimens are reported to have shown persistent phosphorescence, Gems, Sixth Edition (2006) | ||||||||
| Crystallography of Herderite | |||||||||
| Crystal System | Monoclinic, Blue Chart Gem Identification (2010) More from other references | ||||||||
| Habit | Pseudo-orthorhombic crystals, Gems, Sixth Edition (2006) More from other references | ||||||||
| Geological Environment | |||||||||
| Where found: | Is believed to occur in complex granite pegmatites, Gems, Sixth Edition (2006) | ||||||||
| Further Information | |||||||||
| Mineral information: | Herderite information at mindat.org | ||||||||
| Significant Gem Localities | |||||||||
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