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Formula: (NH4)3Al(C2O4)(PO3OH)2(H2O)
Phosphate
Crystal System: Monoclinic
Specific gravity: 2.093 calculated
Hardness: 1½ to 2
Streak: White
Colour: Colourless
Environments
Thebaite-(NH4) is a new mineral, approved in 2020, and to date (April 2022) reported only from the type
locality.
Localities
At the type locality, the Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa county,
Arizona, USA, thebaite-(NH4) occurs in an unusual bat-guano-related, post-mining assemblage of phases that
include a variety of vanadates, phosphates, oxalates and chlorides, some
containing NH4+. Other secondary minerals found
in association with thebaite-(NH4) are antipinite,
vanadinite and at least one other new mineral. Crystals of
thebaite-(NH4) are colourless blades up to about 0.1 mm in length
(MM 85.3.379-386).
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