This half-flat features Philipsbornite, Osarizawaite, and Brochantite from the Grandview Mine in Arizona, USA, renowned for its diverse secondary mineral assemblages. The specimens exhibit characteristic parageneses of these rare copper minerals in hydrothermally altered vein systems.
Philipsbornite is a copper-bismuth arsenate, Osarizawaite a copper-iron arsenate, and Brochantite a copper sulfate mineral. Some specimens include Cyanotrichite associations, highlighting the complex alterations in the oxidized zones.
Collectors value this lot for its documented provenance and the representative habits of each mineral phase. The strong matrix attachment ensures secure handling, while the structural diversity of the flats provides excellent display material for systematic collections and showcase exhibits.
A unique offering for enthusiasts seeking authentic specimens from classic U.S. mining localities with both scientific interest and display appeal.