svanbergite

{{Infobox mineral | 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 | IMAsymbol = Svb | molweight = | strunz = 8.BL.05 | dana = | system = Trigonal | class = Hexagonal scalenohedral (m) H-M symbol: ( 2/m) | symmetry = Rm | 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 = }} Svanbergite is a colorless, yellow or reddish mineral with the chemical formula SrAl3(PO4)(SO4)(OH)6. It has rhombohedral crystals.

It was first described for an occurrence in Varmland, Sweden in 1854 and named for Swedish chemist Lars Fredrik Svanberg (1805–1878).