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Formula: (NH4)2NaAl(C2O4)(PO3OH)2(H2O)2
Phosphate
Crystal System: Monoclinic
Specific gravity: 2.122 calculated
Hardness: 2½
Streak: White
Colour: Colourless
Environments
Dendoraite-(NH4) is a new mineral, approved in 2020 and to date (November 2024) recorded only
from the type locality.
Localities
At the type locality, the 125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains,
Maricopa county, Arizona, USA, dendoraite-(NH4) occurs in an unusual bat-guano-related,
post-mining assemblage that includes a variety of vanadates, phosphates, oxalates and chlorides, some containing
NH4+. Other secondary minerals found in
association with dendoraite-(NH4) include antipinite,
fluorite, mimetite,
mottramite,
relianceite-(K), rowleyite,
salammoniac, struvite,
vanadinite, willemite and
wulfenite. Crystals of
dendoraite-(NH4) are colourless blades up to ~0.1 mm in length.
(MM 86.4.531-538).
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