Diaspore
Turkey
0.57 carats
© gemselect.com
Diaspore forms greenish-brown, yellow, colourless, sometimes pinkish or white platy crystals with vitreous lustre. Some specimens may show a slight colour change from greenish in daylight to pinkish brown under tungsten light.
Mamaris area in Mugla Province, Turkey seems to be the source of all large gem-quality crystals that have been faceted to date.
Diaspore 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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Diaspore Gemstones by Size
This table shows distribution of Diaspore 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:0.55 cts
Heaviest:15.06 cts
Average:3.44 cts
Total photos:33
Do you have a larger Diaspore? Why not upload a photo?
| General Information | |||||||
|---|---|---|---|---|---|---|---|
| Varieties/Types: | Colour-change diaspore - Diaspore showing a noticable colour change effect. | ||||||
| Chemical Formula |
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| Physical Properties of Diaspore | |||||||
| Mohs Hardness | 6.5 to 7, Blue Chart Gem Identification (2010) More from other references | ||||||
| Specific Gravity | 3.30 to 3.40, Blue Chart Gem Identification (2010) More from other references | ||||||
| Cleavage Quality | Perfect, Blue Chart Gem Identification (2010) Perfect and easyMore from other references | ||||||
| Optical Properties of Diaspore | |||||||
| Refractive Index | 1.702 to 1.750, Blue Chart Gem Identification (2010) More from other references | ||||||
| Optical Character | Biaxial/+, Blue Chart Gem Identification (2010) More from other references | ||||||
| Birefringence | 0.048, Blue Chart Gem Identification (2010) DoublingMore from other references | ||||||
| Chatoyancy | Rare, Blue Chart Gem Identification (2010) | ||||||
| Colour | |||||||
| Colour (General) | Greenish-brown, colourless, white, yellow, bluish, pink., Gemstones of the world (2001) More from other references | ||||||
| Colour (Daylight) | Greenish, Gems, Sixth Edition (2006) | ||||||
| Colour (Incandescent Light) | Pinkish brown under tungsten light, Gems, Sixth Edition (2006) | ||||||
| Transparency | Transparent,Translucent, Gemstones of the world (2001) More from other references | ||||||
| Lustre | Vitreous,Pearly, Gemstones of the world (2001) On cleavage surfaces mother-of-pearl lustre. | ||||||
| Crystallography of Diaspore | |||||||
| Crystal System | Orthorhombic, Blue Chart Gem Identification (2010) More from other references | ||||||
| Habit | Platy crystals, Gems, Sixth Edition (2006) | ||||||
| Geological Environment | |||||||
| Where found: | Diaspore may be formed by the hydrothermal alteration of aluminous minerals and may be a hydrothermal mineral in some alkalic pegmatites., Gems, Sixth Edition (2006) | ||||||
| Spectrographic Data | |||||||
| Calculated Spectra: Click spectra for more information | Colour-change diaspore - Locality: Turkey | ||||||
| Further Information | |||||||
| Mineral information: | Diaspore information at mindat.org | ||||||
| Significant Gem Localities | |||||||
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