Mineralpedia Details for Timroseite

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Timroseite

Named to honor Timothy Rose, an American geochemist, mineral collector and micromounter who was the one to collect the first studied material. It occurs in only Californa and New Mexico in the United States with its co-type localities at the Bird Nest Drift and Aga Mine in Otto Mountain in California. It occurs on fracture surfaces and small vugs in brecciated quartz veins. It is associated with acanthite, cerussute, bromine-rich chlorargyrite, chyrsocolla, gold, housleyite, iodargyrite, khinite-4O, markcooperite, ottoite, paratimroseite, thorneite, vauquelinite, and wulfenite. Timroseite appears as olive to lime green, irregular, rounded masses, and as crystals in equant rhombs and diamond shaped plates in sheaf-like aggregates.

Ref. Kampf, A. R., et al. and American Mineralogist October v. 95 no. 10 p. 1560-1568

Formula: Pb₂Cu₅(TeO₆)₂(OH)₂
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Timroseite from Bird Nest drift, Otto Mountain, San Bernardino Co., California, United States

Timroseite was recently described by Kampf et al in American Mineralogist (2010), 95, 1560-1568. It occurs with host of other tellurates such as housleyite, khinite, markcooperite, ottoite, paratimroseite, and thorneite. Timroseite occurs as as "olive to lime green, irregular, rounded masses and rarely in crystals as dark olive green, equant rhombs, and diamond-shaped plates in subparallel sheaf-like aggregates". This specimen shows these habits and crystals - although the micro crystals are extremely small. As per Tim, this specimen also contains a yet-to-be-described turquoise colored tellurate. Tim is a highly active field collector, a member of the NCMA and editor for the International Federation of Micromount Societies newsletter.