Creedite
Image: JJ Harrison (https://www.jjharrison.com.au/) (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, peach, white, colorless, pink, purple, yellow, brown
Transparencytransparent
Type LocalityNavidad Mine, Rodeo, Durango, Mexico
Mineral GroupHalide-Sulfate
Usescollector
Associated Mineralsfluorite, limonite, kaolinite, quartz, calcite
Rarityuncommon
Description
This specimen features a vibrant orange, botryoidal-like cluster of radiating Creedite crystals, exhibiting sharp terminations and a translucent to transparent appearance. The aggregate forms a striking, spiky mass.
Geological Context
Creedite is a secondary mineral typically found in the oxidized zones of fluorine-bearing ore deposits, often forming in cavities or veins. It results from the alteration of fluorite and other aluminum-rich minerals in hydrothermal environments.
