Creedite
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (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 to subconchoidal
Specific Gravity2.71
Colorsorange, peach, brownish-orange
Transparencytransparent to translucent
Type LocalityNavidad Mine (Mina Navidad; Abasolo Mine; Rodeo Mine), Abasolo, Rodeo, Municipio de Rodeo, Durango, Mexico
Mineral Grouphalides
Usescollector
Associated Mineralsfluorite, cryolite, quartz, limonite, kaolinite, calcite
Rarityuncommon
Description
This specimen showcases a radiating cluster of sharp, prismatic to acicular creedite crystals, exhibiting a vibrant orange to peach color. The crystals are well-formed and display good transparency.
Geological Context
Creedite is a rare secondary mineral typically found in the oxidized zones of fluorine-bearing ore deposits, often forming in cavities or fractures within the host rock. It is an alteration product of other fluorine-rich minerals.
