Boleite on Anglesite

specimen number:
2133156

location:
Boleo, Santa Rosalia, Baja California Sur, Mexico

description:
Blue cubic crystals of boleite measuring to 0.3 cm on edge across the top of a grouping of crystallized anglesite. In good condition.

Boleite is a rare and visually distinctive halide mineral composed of lead, copper, silver, and chloride, known for its striking deep blue color and well formed cubic crystals. It forms as a secondary mineral in the oxidation zones of complex ore deposits, typically under arid conditions where chloride rich fluids are present. The type locality for boleite is Boleo in Baja California Sur, Mexico, a mining district developed in the late 19th century for the extraction of copper from sediment hosted deposits. At Boleo, boleite occurs in association with other rare secondary minerals such as cumengeite and pseudoboleite, often forming sharp, lustrous cubes that are highly prized by collectors. Specimens from this locality are considered among the finest examples of the mineral, making boleite from Boleo an important part of both mineralogical study and collecting history.

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