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Mineralpedia Details for Creedite

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Creedite

Creedite

Named for the type locality near the town of Creede at the Colorado Fluorspar Co. mine in Mineral County, Colorado, USA. Additional localities for Creedite occur in others in the USA, Mexico, Bolivia, Tajikistan, and Kazakhstan, among other minor localities. Creedite occurs as an uncommon mineral in fluorite-bearing hydrothermal mineral deposits. Associated minerals at the type locality include fluorite, baryte, and kaolinite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/creedite.pdf

Formula
Ca3Al2(SO4)(OH)2F8ยท2H2
Crystal System
Monoclinic 
Crystal Habit
Granular, Radial, Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Greasy 
Color
colorless, violet, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
3.5 
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Creedite from West Camp, Santa Eulalia, Chihuahua, Mexico

Creedite
            from West Camp, Santa Eulalia, Chihuahua, Mexico

Sharp, translucent, deep purple crystals to 8mm.

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Creedite from Navidad mine, Abasolo, Rodeo, Durango, Mexico

Creedite
            from Navidad mine, Abasolo, Rodeo, Durango, Mexico

Large "ball" of hundreds of prismatic Creedite crystals from 3 to 6mm stained rusty red.

Click thumbnail images for larger view.

Creedite from Liberty (Hall) mine, Nye Co., Nevada, United States

Creedite
            from Liberty (Hall) mine, Nye Co., Nevada, United States

Light lilac colored tiny 1mm Creedite crystals with good coverage.

Light purple crystals to 2-3mm covering entire matrix.

Click thumbnail images for larger view.

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