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| ගිනිබොකු තෝර | |
|---|---|
 Andalusite | |
| General | |
| Category | |
| Al2SiO5 | |
| 09.AF.10 | |
| 2/m 2/m 2/m - Dipyramidal | |
| a = 7.7980 b = 7.9031 Å c = 5.5566 Å; Z = 4 | |
| Identification | |
| පාට / පැහැය | Pink, violet, yellow, green, white, gray; in thin section, colorless to pink or green |
| As euhedral crystals or columnar aggregates having nearly square cross sections; fibrous compact to massive | |
| On {101}, rare | |
| Good on {110}, poor on {100} | |
| uneven to subconchoidal | |
| hardness | 6.5 - 7.5 |
| Vitreous | |
| White | |
| Transparent to nearly opaque with inclusions | |
| 3.17 (+/- .04) | |
| Optical properties | double refractive, biaxial negative; chiastolite has anomalous aggregate reaction. |
| nα = 1.629 - 1.640 nβ = 1.633 - 1.644 nγ = 1.638 - 1.650 | |
| δ = 0.009 - 0.010 | |
| Weak | |
| 71 - 86° | |
| r < v strong | |
| Ultraviolet | non-fluorescent |
| References | |
- , GIA Gem Reference Guide 1995,
- http://rruff.geo.arizona.edu/doclib/hom/andalusite.pdf Handbook of Mineralogy
- http://www.mindat.org/show.php?id=217&ld=1&pho= Mindat.org
- http://webmineral.com/data/Andalusite.shtml Webmineral data
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ග න බ ක ත රAndalusiteGeneralCategoryAl2SiO509 AF 102 m 2 m 2 m Dipyramidala 7 7980 b 7 9031 A c 5 5566 A Z 4Identificationප ට ප හ යPink violet yellow green white gray in thin section colorless to pink or greenAs euhedral crystals or columnar aggregates having nearly square cross sections fibrous compact to massiveOn 101 rareGood on 110 poor on 100 uneven to subconchoidalhardness6 5 7 5VitreousWhiteTransparent to nearly opaque with inclusions3 17 04 Optical propertiesdouble refractive biaxial negative chiastolite has anomalous aggregate reaction na 1 629 1 640 nb 1 633 1 644 ng 1 638 1 650d 0 009 0 010Weak71 86 r lt v strongUltravioletnon fluorescentReferences GIA Gem Reference Guide 1995 ISBN 0 87311 019 6 http rruff geo arizona edu doclib hom andalusite pdf Handbook of Mineralogy http www mindat org show php id 217 amp ld 1 amp pho Mindat org http webmineral com data Andalusite shtml Webmineral data