| General Information |
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| A variety or type of: | Feldspar |
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| 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. |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Albite Treatments |
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| Irradiation may turn colourless material blue if lead and water impurities are present (see amazonite). |
| Physical Properties of Albite |
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| Mohs Hardness | 6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Specific Gravity | 2.61 to 2.62Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Cleavage Quality | PerfectMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Fracture | Uneven,ConchoidalMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Refractive Index | 1.529 to 1.542Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Birefringence | 0.009Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| 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/www/gemdat/gemshow_class.php on line 690 |
| ( ! ) mysqli_sql_exception: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb3_uca1400_ai_ci,COERCIBLE) for operation '=' in /big/www/gemdat/gemshow_class.php on line 690 |
| Call Stack |
| # | Time | Memory | Function | Location |
| 1 | 0.0009 | 360344 | {main}( ) | .../gshow.php:0 |
| 2 | 0.1302 | 827088 | gemshow_class->do_optical( ) | .../gshow.php:151 |
| 3 | 0.1445 | 843640 | gemshow_class->showblock( $txt = 'DISPERS-MIN' ) | .../gemshow_class.php:1469 |
| 4 | 0.1446 | 860776 | gemshow_class->showdata( $dataname = 'DISPERS-MIN' ) | .../gemshow_class.php:505 |
| 5 | 0.1446 | 861240 | query( $query = 'select * from mineralproperties,mineralpropertytypes where \r\n\t\t\t\t\tmp_mpt_id=mpt_id and mpt_code=\'DISPERS-MAX\' and \r\n\t\t\t\t\tmp_min_id=\'96\' and mp_deleted=0 and\r\n\t\t\t\t\tmp_reference=\'Gems, Sixth Edition\' and\r\n\t\t\t\t\tmp_referenceauthor=\'Michael O’Donoghue\' and\r\n\t\t\t\t\tmp_referenceyear=\'2006\' and\r\n\t\t\t\t\tmp_referencepublisher=\'Elsevier\' and\r\n\t\t\t\t\tmp_referenceperiodical=\'\'' ) | .../gemshow_class.php:690 |
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