| 词条 | Svanbergite |
| 释义 |
| name = Svanbergite | boxwidth = | boxbgcolor = | image = Svanbergite w-pyrophyllite on andalusite Basic strontium aluminum phosphate Donally Mine near Thorne Minerals County Nevada 1879.jpg | imagesize = | alt = | caption = Svanbergite with pyrophyllite and andalusite | category = Phosphate minerals | formula = SrAl3(PO4)(SO4)(OH)6 | molweight = | strunz = 8.BL.05 | dana = | system = Trigonal | class = Hexagonal scalenohedral ({{overline|3}}m) H-M symbol: ({{overline|3}} 2/m) | symmetry = R{{overline|3}}m | unit cell = a = 6.970–6.992 Å c = 16.567–16.75 Å, Z = 3 | color = Colorless, cream-yellow, rose, reddish brown | colour = | habit = Rhombohedral crystals (to pseudocubic); granular, massive | twinning = | cleavage = Distinct on {0001} | fracture = | tenacity = | mohs = 5 | luster = Vitreous to adamantine | streak = | diaphaneity = Translucent | gravity = 3.22 | density = | polish = | opticalprop = Uniaxial (+) | refractive = nω = 1.631–1.635 nε= 1.646–1.649 | birefringence = δ=0.0140-0.0150 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2] }}Svanbergite is a colorless, yellow or reddish mineral with the chemical formula SrAl3(PO4)(SO4)(OH)6. It has rhombohedral crystals.[3] It was first described for an occurrence in Varmland, Sweden in 1854 and named for Swedish chemist Lars Fredrik Svanberg (1805–1878).[1][2] It occurs in high aluminium medium-grade metamorphic rocks; in bauxite deposits and from sulfate enriched argillic alteration ( high silica and clay) associated with hydrothermal systems often replacing apatite. It occurs with pyrophyllite, kyanite, andalusite, lazulite, augelite, alunite, kaolinite and quartz.[1] References{{commons category| Svanbergite}}1. ^1 2 Mineral Handbook {{clear|left}}{{Phosphate-mineral-stub}}2. ^1 Webmineral 3. ^Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "Dana's new mineralogy", p. 962. John Wiley & Sons, 1997 4 : Phosphate minerals|Sulfate minerals|Strontium minerals|Trigonal minerals |
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