Moolooite

Moolooite is a rare blue-green mineral with the formula Cu(C₂O₄)·n(H₂O) (n<1) (copper(II) oxalate hydrate). It was discovered in Bunbury Well, Mooloo Downs station, Murchison, Western Australia in 1986.^[3] It has an orthorhombic crystalline structure, and is formed by the interaction of bird guano with weathering copper sulfides.

Moolooite
Blue massive moolooite (field of view 12 mm)
General
Category	Oxalate mineral
Formula	Cu(C2O4) · 0.4H2O
IMA symbol	Moo[1]
Strunz classification	10.AB.15
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pnnm
Identification
Color	green
Specific gravity	3.43 (calculated)
Density	2.6
References	[2]

A second occurrence is reported from the Sainte-Marie-aux-Mines silver mining district of Vosges Mountains, France.^[3]