Ulrichite

Ulrichite is a rare green uranium phosphate mineral (CaCu(UO₂)[PO₄]₂·4H₂O).^[2] It crystallizes as monoclinic prisms which occur as apple green acicular radiating clusters.^[3] It is radioactive and exhibits strong yellow fluorescence under ultraviolet radiation.^[2]

Ulrichite
Ulrichite (three green vugs)
General
Category	Phosphate mineral
Formula	CaCu(UO2)[PO4]2·4H2O
IMA symbol	Ulr[1]
Strunz classification	8.EA.15
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/c
Identification
Other characteristics	Radioactive

Ulrichite was first described in 1988 for samples from the Lake Boga granite quarry, Lake Boga, Victoria, Australia. It was named for George H. F. Ulrich (1830–1900),^[3] a 19th-century government geologist and mines department inspector. The type locality at Lake Boga is the only reported occurrence and the type specimen is located at the Museum Victoria, Melbourne, Australia, as #M38576.^[3]

It is of secondary origin in granite pegmatites where it is found in miarolitic cavities. It occurs associated with turquoise, chalcosiderite, cyrilovite, torbernite, libethenite, sampleite, saleeite and fluorapatite.^[3]