Orthoclase
Itrongay (Itrongahy), Mahasoa Est, Betroka, Anosy, Madagascar
7.67 carats
© Rarestone.com
Orthoclase 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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Orthoclase Gemstones by Size
This table shows distribution of Orthoclase 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:1.36 cts
Heaviest:21.50 cts
Average:7.01 cts
Total photos:30
Do you have a larger Orthoclase? Why not upload a photo?
| General Information | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Feldspar | |||||||||
| Varieties/Types: | Moonstone - A variety of Orthoclase that exhibits a strong blue adularescence. Sanidine - A triclinic Potassium Feldspar found in lavas. | |||||||||
| Chemical Formula |
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| Physical Properties of Orthoclase | ||||||||||
| Mohs Hardness | 6, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Specific Gravity | 2.54 to 2.61, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Tenacity | Brittle, Gems, Sixth Edition (2006) | |||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) More from other references | |||||||||
| Fracture | Uneven, Gems, Sixth Edition (2006) More from other references | |||||||||
| Refractive Index | 1.518 to 1.536, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Optical Character | Biaxial/-, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Birefringence | 0.005 to 0.008, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Pleochroism | Weak, Gems, Sixth Edition (2006) More from other references | |||||||||
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