Home > Laskowski Ⅷ – September 21 > MS1960 Pyroaurite on Tetraferriphlogopite

Pyroaurite on Tetraferriphlogopite

Pyroaurite is a magnesium iron carbonate hydroxide; it is a member of the hydrotalcite group (Mills et al., 2012). Tetraferriphlogopite takes its name from it content of tetrahedral (four-coordinated) iron in otherwise identical to phlogopite. The mineral name first appears in a nomenclature report for the mica group (Rieder et al. 1998).

Pyroaurite, once known as sjögrenite, forms pearly flakses on a matrix of calcite and brucite. A prominent crystal of tetraferriphlogopite, 2.1 cm across, is present. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona. An LBL Minerals label accompanies the specimen.

Price: $100

Item code: MS1960

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