Barlowite
Barlowite is an IMA-recognized mineral species in the halide class, with the chemical formula Cu₄BrF(OH)₆.
It crystallizes in the hexagonal crystal system (space group P6_3/mmc). It is a member of the Claringbullite structural group.
Key properties: Mohs hardness 2–2.5; specific gravity 3.8; Sky-blue streak; Vitreous luster; optically uniaxial.
IMA symbol Blw, IMA status: approved, named in 2010.
Found as a secondary mineral in the weathering zone of a copper deposit.
It is found associated with Gerhardtite, brochantite, cuprite, quartz, goethite.
The mineral was named to honor William Barlow (1845-1934).
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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