General Information |
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A variety or type of: | Orthoclase, which is a variety of Feldspar |
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Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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Sanidine Treatments |
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Some sanidine subjected to iridation turns amber or smoky coloured. |
Physical Properties of Sanidine |
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Mohs Hardness | 6Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Specific Gravity | 2.54 to 2.61Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Tenacity | BrittleMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Cleavage Quality | GoodMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Fracture | Uneven,ConchoidalMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Optical Properties of Sanidine |
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Refractive Index | 1.518 to 1.536Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Optical Character | Biaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Birefringence | 0.005 to 0.008Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Pleochroism | WeakMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Dispersion | WeakMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Colour |
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Colour (General) | Light gray to light brownish varietyHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Transparency | Transparent,TranslucentMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Lustre | VitreousMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Fluorescence & other light emissions |
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Fluorescence (General) | Weak reddish orange under both LWUV and SWUV (Madagascar)Michael O’Donoghue, Gems, Sixth Edition (2006) |
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Crystallography of Sanidine |
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Crystal System | MonoclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Habit | A flattened crystalMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Geological Environment |
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Where found: | Sanidine is a common constituent in acid and intermediate volcanic rocks such as rhyolites, dacites and trachytes; where the rock cooled quickly at above approximately 900°C, sanidine is the stable structureMichael O’Donoghue, Gems, Sixth Edition (2006) |
Further Information |
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Mineral information: | Sanidine information at mindat.org |
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Significant Gem Localities |
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| Madagascar | |
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| | | Myanmar | |
| Ted Themelis (2008) Gems & mines of Mogok |
| Ted Themelis (2008) Gems & mines of Mogok |
- Pein-Pyit (Painpyit; Pyan Pyit)
| Ted Themelis (2008) Gems & mines of Mogok | | Sri Lanka | |
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