Creedite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameCreedite
Chemical FormulaCa3Al2(SO4)(F,OH)10·2H2O
Mohs Hardness3.5
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavageperfect on {100}
Fractureuneven
Specific Gravity2.75
Colorsorange, amber, white, colorless, yellow, purple
Transparencytransparent
Type LocalityNavidad Mine, Abasolo, Rodeo, Municipio de Rodeo, Durango, Mexico
Mineral GroupHalide-sulfate
Usescollector
Associated Mineralsfluorite, cryolite, quartz, limonite
Rarityuncommon
Description
This specimen showcases a vibrant, radiating cluster of sharp, prismatic creedite crystals, displaying a rich orange to amber color and a bright vitreous luster. The aggregate forms an attractive, spiky growth.
Geological Context
Creedite is a rare secondary mineral typically found in the oxidized zones of fluorine-bearing ore deposits, often forming in hydrothermal alteration environments.
