Creedite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameCreedite
Chemical FormulaCa₂SO₄F₂(OH)·2H₂O
Mohs Hardness3.5
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavageperfect on {100}
Fractureuneven to conchoidal
Specific Gravity2.72
Colorsorange, amber, white, yellow, purple, colorless
Transparencytransparent
Type LocalityNavidad Mine (Mina Navidad; Abasolo Mine; Rodeo Mine), Abasolo, Rodeo, Municipio de Rodeo, Durango, Mexico
Mineral GroupHalides
Usescollector
Associated Mineralsfluorite, cryolite, topaz
Rarityuncommon
Description
This specimen showcases a striking spherical aggregate of radiating, sharp, prismatic creedite crystals, exhibiting a vibrant orange to amber color.
Geological Context
Creedite is a rare secondary mineral typically found in fluorine-rich hydrothermal deposits, often occurring in altered granitic pegmatites or in the oxidation zones of fluorite-bearing ore deposits.
