Thebaite-(NH4)

thebaite-(NH4)

antipinite

vanadinite

phosphate

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Formula: (NH4)3Al(C2O4)(PO3OH)2(H2O)
Phosphate
Specific gravity: 2.093 calculated
Hardness: 1½ to 2
Streak: White
Colour: Colourless
Environments

Hydrothermal 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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