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Cumengeite is an uncommon mineral that forms some of the most interesting crystal shapes of all minerals. Its most famous habit is as epitaxial overgrowths over Boleite, where a single specimen has an inner cubic core of Boleite, and outer protruding crystal faces of Cumengeite in triangular habit, forming a star-like formation.
Cumengeite has been found in several localities worldwide, however, its only significant source was the the Amelia Mine in Baja California, Mexico. To date, this is the only only locality that had produced this mineral in well-formed crystals of any significance.
Cumengeite is named for Edouard Cumenge (1828-1902), a French mining engineer who was among the first to collect this mineral at its type locality of Boleo, Mexico. |
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A rare collectors mineral, with good epitaxial crystals being highly valuable.
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The premier locality for Cumengeite, which is also the type locality, is the Amelia mine, Santa Rosalia (Boleo), Baja California Sur, Mexico. This is the only area where Cumengeite occurs as relatively large crystals.
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The unique crystal formations and locality can distinguish this mineral from all other minerals.
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Have a question about Cumengeite? Visit our Q&A Community and ask the experts!
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