Svanbergite
(repeating unit)SrAl3(PO4)(SO4)(OH)6 IMA symbol Svb[1] Strunz classification 8.BL.05 Crystal system Trigonal Crystal class Hexagonal scalenohedral (3m)
H-M symbol: (3 2/m) Space group R3m Unit cell a = 6.970–6.992 Å
c = 16.567–16.75 Å, Z = 3 Identification Color Colorless, cream-yellow, rose, reddish brown Crystal habit Rhombohedral crystals (to pseudocubic); granular, massive Cleavage Distinct on {0001} Mohs scale hardness 5 Luster Vitreous to adamantine Diaphaneity Translucent Specific gravity 3.22 Optical properties Uniaxial (+) Refractive index nω = 1.631–1.635 nε= 1.646–1.649 Birefringence δ=0.0140–0.0150 References [2][3] 
Svanbergite crystals on white dolomite from Radium Hot Springs, British Columbia, Canada (size: 3 × 2.5 × 2.1 cm) 
H-M symbol: (3 2/m)
c = 16.567–16.75 Å, Z = 3
Svanbergite is a colorless, yellow or reddish mineral with the chemical formula SrAl3(PO4)(SO4)(OH)6. It has rhombohedral crystals.[4]
It was first described for an occurrence in Varmland, Sweden in 1854 and named for Swedish chemist Lars Fredrik Svanberg (1805–1878).[2][3]
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.[2]
References
Wikimedia Commons has media related to Svanbergite.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c Mineral Handbook
- ^ a b Webmineral
- ^ 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
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