Svanbergite SrAl3(PO4)(SO4)(OH)6 Hexagonal

Description: Svanbergite forms as small authigenic grains in sedimentary and in metasedimentary rocks. It is possibly deposited as a result of bacterial action on the sea floor.

SAUK COUNTY: Microscopic grains of svanbergite occur in metapelite layers within the Baraboo Quartzite where it is associated with pyrophyllite, quartz, hematite and rutile. Grains are "equant and have diameters of 10-20 microns". The svanbergite ranges from nearly pure svanbergite to a composition approaching goyazite. (Medaris and Fournelle, 1998).

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