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| Topaz | |
|---|---|
 Facet Cut Topaz Gemstones in various colors | |
| General | |
| Category | |
| Al2SiO4(F,OH)2 | |
| 9.AF.35 | |
| Orthorhombic dipyramidal : (2/m 2/m 2/m) : Pbnm | |
| a = 4.65 Å, b = 8.8 Å, c = 8.4 Å; Z = 4 | |
| Identification | |
| පාට / පැහැය | Colorless (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink |
| Prismatic crystals with faces striated parallel to long dimension; also columnar, compact, massive | |
| [001] Perfect | |
| to uneven | |
| hardness | 8 (defining mineral) |
| Vitreous | |
| White | |
| Transparent | |
| 3.49–3.57 | |
| Optical properties | Biaxial (+) |
| nα = 1.606–1.629 nβ = 1.609–1.631 nγ = 1.616–1.638 | |
| δ = 0.010 | |
| Weak in thick sections X = yellow; Y = yellow, violet, reddish; Z = violet, bluish, yellow, pink | |
| Other characteristics | Fluorescent, short UV=golden yellow, long UV=cream |
| References | |
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed.,
- Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C., ed. (1995). "Topaz". Handbook of Mineralogy (PDF). Vol. II (Silica, Silicates). Chantilly, VA, US: Mineralogical Society of America. ISBN . සම්ප්රවේශය December 5, 2011.
{{}}: CS1 maint: multiple names: editors list () - Topaz. Mindat.org. Retrieved on 2011-10-29.
- Topaz. Webmineral.com. Retrieved on 2011-10-29.
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TopazFacet Cut Topaz Gemstones in various colorsGeneralCategoryAl2SiO4 F OH 29 AF 35Orthorhombic dipyramidal 2 m 2 m 2 m Pbnma 4 65 A b 8 8 A c 8 4 A Z 4Identificationප ට ප හ යColorless if no impurities blue brown orange gray yellow green pink and reddish pinkPrismatic crystals with faces striated parallel to long dimension also columnar compact massive 001 Perfectto unevenhardness8 defining mineral VitreousWhiteTransparent3 49 3 57Optical propertiesBiaxial na 1 606 1 629 nb 1 609 1 631 ng 1 616 1 638d 0 010Weak in thick sections X yellow Y yellow violet reddish Z violet bluish yellow pinkOther characteristicsFluorescent short UV golden yellow long UV creamReferencesHurlbut Cornelius S Klein Cornelis 1985 Manual of Mineralogy 20th ed ISBN 0 471 80580 7 Anthony John W Bideaux Richard A Bladh Kenneth W and Nichols Monte C ed 1995 Topaz Handbook of Mineralogy PDF Vol II Silica Silicates Chantilly VA US Mineralogical Society of America ISBN 0 9622097 1 6 සම ප රව ශය December 5 2011 a href wiki E0 B7 83 E0 B7 90 E0 B6 9A E0 B7 92 E0 B6 BD E0 B7 8A E0 B6 BD Cite book class mw redirect title ස ක ල ල Cite book cite book a CS1 maint multiple names editors list link Topaz Mindat org Retrieved on 2011 10 29 Topaz Webmineral com Retrieved on 2011 10 29