svanbergite

{{Infobox mineral

| name = Svanbergite

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| image = Svanbergite w-pyrophyllite on andalusite Basic strontium aluminum phosphate Donally Mine near Thorne Minerals County Nevada 1879.jpg

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| caption = Svanbergite with pyrophyllite and andalusite

| category = Phosphate minerals

| formula = SrAl₃(PO₄)(SO₄)(OH)₆

| IMAsymbol = Svb{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

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| strunz = 8.BL.05

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| 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

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| habit = Rhombohedral crystals (to pseudocubic); granular, massive

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| cleavage = Distinct on {0001}

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| mohs = 5

| luster = Vitreous to adamantine

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| diaphaneity = Translucent

| gravity = 3.22

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| opticalprop = Uniaxial (+)

| refractive = n_ω = 1.631–1.635 n_ε= 1.646–1.649

| birefringence = δ=0.0140–0.0150

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| references = [http://www.handbookofmineralogy.org/pdfs/svanbergite.pdf Mineral Handbook][http://webmineral.com/data/Svanbergite.shtml Webmineral]

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Svanbergite is a colorless, yellow or reddish mineral with the chemical formula SrAl₃(PO₄)(SO₄)(OH)₆. It has rhombohedral crystals.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

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

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.

File:Svanbergite-Dolomite-21593.jpg, British Columbia, Canada (size: 3 × 2.5 × 2.1 cm)]]

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