Boleite
Image: Shannon Heinle (CC0)
Mineral NameBoleite
Chemical FormulaPb26Cu24Ag10Cl62(OH)48•3H2O
Mohs Hardness2.5
Crystal Systemcubic
Lustervitreous
Streak Colorpale blue
Cleavageperfect on {001}
Fractureconchoidal
Specific Gravity5.05
Colorsbright blue
Transparencytransparent
Type LocalityBoleo, Baja California Sur, Mexico
Mineral GroupHalides
Usesjewelry, collector
Associated Mineralsleadhillite, quartz
Rarityrare
Description
This sample features bright blue cubic crystals of Boleite, a hydrated lead copper silver chloride hydroxide. The specimen is approximately 4 cm across and also contains light green-buff leadhillite and brown quartz.
Geological Context
Boleite is a rare secondary mineral typically found in the oxidized zones of lead-copper ore deposits, often in arid environments where specific chemical conditions allow its formation.
