Phenakite 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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Phenakite Gemstones by Size
This table shows distribution of Phenakite 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:0.41 cts
Heaviest:3.27 cts
Average:1.27 cts
Total photos:11
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| General Information | ||||||||||
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| Chemical Formula |
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| Phenakite Treatments | ||||||||||
| Colorless material has been reported to turn a yellow-brown color on irradiation (Pough and Rogers, 1947). One could expect this change to be reversed by heating - Nassau (1984) | ||||||||||
| Physical Properties of Phenakite | ||||||||||
| Mohs Hardness | 7.5 to 8, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Specific Gravity | 2.90 to 2.98, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Tenacity | Brittle, Gemstones (2009) | |||||||||
| Cleavage Quality | Distinct, Gemmological Tables (2004) More from other references | |||||||||
| Optical Properties of Phenakite | ||||||||||
| Refractive Index | 1.650 to 1.695, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Optical Character | Uniaxial/+, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Birefringence | 0.016, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Pleochroism | Distinct: colorless - orangy-yellow, Blue Chart Gem Identification (2010) | |||||||||
| Dispersion | 0.015, Gemstones (2009) | |||||||||
| Colour | ||||||||||
| Colour (General) | Usually colorless to light yellow, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Transparency | Transparent, Gemmological Tables (2004) More from other references | |||||||||
| Lustre | Vitreous, Gemstones (2009) | |||||||||
| Fluorescence & other light emissions | ||||||||||
| Fluorescence (General) | Inert to weak greenish, blue, pink, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Fluorescence (X-RAY) | Specimens show a distinct blue, Gems, Sixth Edition (2006) | |||||||||
| Crystallography of Phenakite | ||||||||||
| Crystal System | Trigonal, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Habit | Rhombohedral, tabular to prismatic crystals, Gems, Sixth Edition (2006) More from other references | |||||||||
| Geological Environment | ||||||||||
| Where found: | Phenakite occurs in granite pegmatites., Gems, Sixth Edition (2006) | |||||||||
| Inclusions in Phenakite | ||||||||||
| (Veils of) 2-phase inclusions, rutile needles - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 | ||||||||||
| Further Information | ||||||||||
| Mineral information: | Phenakite information at mindat.org | |||||||||
| Significant Gem Localities | ||||||||||
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