| 词条 | Vishnevite |
| 释义 |
| name = Vishnevite | boxwidth = | boxbgcolor = | image = Vishnevite - sulfate cancrinite w- orthoclase and melanite Hydrous sodium calcium potassium aluminum silicate sulfate and carbonate Loch Borrolan Sutherland Scotland 1650.jpg | imagesize = 260px | alt = | caption = Vishnevite from Scotland | category = Tectosilicate | formula = (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·nH2O | molweight = | strunz = 9.FB.05 | system = Hexagonal | class = Pyramidal (6) H-M symbol: (6) | symmetry = P63 | unit cell = a = 12.7228(3) c = 5.198(3) [Å]; Z = 1 | color = Colorless, light blue, orange-yellow, white | colour = | habit = | twinning = | cleavage = Perfect | fracture = | tenacity = | mohs = 5 - 6 | luster = Vitreous, pearly | streak = White | diaphaneity = | gravity = | density = | polish = | opticalprop = Uniaxial (-) | refractive = nω = 1.490 - 1.507 nε = 1.488 - 1.495 | birefringence = δ = 0.002 - 0.012 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}Vishnevite, or sulfatic cancrinite, is a mineral of the cancrinite group with the chemical formula (Na, Ca, K)6(Si, Al)12O24[(SO4),(CO3), Cl2]2-4·nH2O. It has hexagonal crystals.[1][2] References1. ^Fleischer, Michael & Mandarino, Joseph, "Glossary of Mineral Species", The Mineralogical Record, 1991 2. ^Webmineral data External links
2 : Cancrinite group|Hexagonal minerals |
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