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Input interpretation:

topaz  (mineral)


General properties:

formula | Al_2SiO_4(F,OH)_2


Basic properties:

density | 3.55 g\/cm^3\ntransparency | transparent\nbirefringence | 0.0095\nluster | vitreous\nMohs hardness | 8\ntenacity | brittle\nstreak | white\nmagnetism | nonmagnetic\ncolor | colorless  |  pale blue  |  yellow  |  yellowish brown  |  red\nfracture | brittle  |  uneven\nmolar mass | 182.3 g\/mol  (grams per mole)


Mineral identifiers:

Strunz ID | VIII\/B.02-70\nDana ID | 52.3.1.1


Crystallographic properties:

crystal system | orthorhombic\ncrystal class | 2\/m2\/m2\/m\nunit cell volume | 321.6 Å^3  (ångströms cubed)\nd-spacing | 2.937 Å  (ångströms)  |  3.195 Å  (ångströms)  |  3.369 Å  (ångströms)\nintensity | 100%  |  65%  |  60%\nmolecules per unit cell | 4\n2V angle | 29 pi\/90 radians~~58°  (degrees)\nrefractive indices | 1.6175  |  1.62  |  1.627  |  0  |  0  |  0\ndispersion | moderate  |  r > v\nunit cell lengths | 4.35 Å  (ångströms)  |  8.8 Å  (ångströms)  |  8.4 Å  (ångströms)\nunit cell angles | 90°  (degrees)  |  90°  (degrees)  |  90°  (degrees)


Wikipedia summary:


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