
Oligoclase
Kenya
1.59 carats
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| General Information | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Feldspar | |||||||||
| Varieties/Types: | Andesine - A plagioclase feldspar with an Albite: Anorthite molar ratio ranging from 50:50 to 70:30. Oligoclase - A plagioclase feldspar with an Albite: Anorthite molar ratio ranging from 90:10 to 70:30. | |||||||||
| Chemical Formula |
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| Albite Treatments | ||||||||||
| Irradiation may turn colourless material blue if lead and water impurities are present (see amazonite). | ||||||||||
| Physical Properties of Albite | ||||||||||
| Mohs Hardness | 6 to 6.5, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Specific Gravity | 2.61 to 2.62, Gemmological Tables (2004) More from other references | |||||||||
| Tenacity | Brittle, Gems, Sixth Edition (2006) | |||||||||
| Cleavage Quality | Perfect, Gems, Sixth Edition (2006) Perfect to excellent | |||||||||
| Fracture | Uneven,Conchoidal, Gems, Sixth Edition (2006) | |||||||||
| Refractive Index | 1.529 to 1.542, Gemmological Tables (2004) More from other references | |||||||||
| Optical Character | Biaxial/+, Blue Chart Gem Identification (2010) | |||||||||
| Birefringence | 0.009, Gemmological Tables (2004) More from other references | |||||||||
| Dispersion | Fatal error: Uncaught mysqli_sql_exception: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb3_uca1400_ai_ci,COERCIBLE) for operation '=' in /big/var/www/gemdat/gemshow_class.php:690 Stack trace: #0 /big/var/www/gemdat/gemshow_class.php(690): mysqli->query() #1 /big/var/www/gemdat/gemshow_class.php(505): gemshow_class->showdata() #2 /big/var/www/gemdat/gemshow_class.php(1469): gemshow_class->showblock() #3 /big/var/www/gemdat/gshow.php(151): gemshow_class->do_optical() #4 {main} thrown in /big/var/www/gemdat/gemshow_class.php on line 690 | |||||||||