Edwindavisite

edwindavisite

Images

Formula: Cu(C₂O₄)(NH₃)
Organic compound, oxalate [(C₂O₄)^2- groups], copper-bearing mineral
Crystal system: Orthorhombic
Specific gravity: 2.55 measured, 2.53 calculated
Hardness: 2
Streak: Pale green
Colour: Green
Solubility: Insoluble in water, but easily soluble in dilute hydrochloric acid at room temperature
Environments

Bat guano deposits

Edwindavisite is a new mineral, approved in 2023 and to date (October 2025) reported only from the type locality.

Localities

At the type locality, 125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA, a new (in 2023) oxalate mineral species, edwindavisite, was discovered. It occurs as fans or sprays of bladed or prismatic crystals (up to 0.50 × 0.08 × 0.06 mm³), associated intimately with ammineite, a sampleite-like mineral, baryte, ebnerite, wulfenite and quartz. Edwindavisite is green, transparent with a pale green streak, a vitreous lustre and one perfect cleavage.
Among about 40 oxalate minerals documented to date (October 2025), edwindavisite is the first one that contains ammonia (NH₃) (MM 89.4.535–543).
Edwindavisite from the Rowley Mine - Image

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