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Formula: (NH4)Zn(PO4)
Phosphate, monoclinic paramorph of hexagonal
ebnerite
Crystal System: Monoclinic
Specific gravity: 2.851 calculated
Hardness: 2
Streak: White
Colour: Colourless
Solubility: At room-temperature, epiebnerite is insoluble in water, but easily soluble in dilute
hydrochloric acid
Environments
Epiebnerite is a new mineral, approved in 2023 and to date (November 2024) reported 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, epiebnerite and its paramorph
ebnerite are new mineral species. They occur in an unusual bat-guano-related,
post-mining assemblage of phases. Epiebnerite grows epitactically on
ebnerite and replaces it. Ebnerite
and epiebnerite are found in intimate association with alunite,
halite, mimetite,
newberyite, sampleite,
struvite and wulfenite on
hematite-rich
quartz–baryte matrix.
Epiebnerite occurs as colourless prisms or blades, up to about 10 × 3 × 2 μm3, in parallel growth
forming ribs with serrated edges epitactic on ebnerite prisms
(MM 88.3.312–318).
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