Creedite
Creedite
Published: June 2014
Modified: October 2021
Creedite was discovered in the Colorado Fluorspar Co. Mine in 1916. The mine is located in the Creede Quadrangle, Mineral County, Colorado and this was the inspiration for its name. It comes in colorless, orange, purple, violet, and white prismatic crystals that sometime radiate from the base.
General Information
Common Name
Creedite
Species
Creedite
Transparency
Opaque-Transparent
Dispersion
Strength: Strong Fire
Refractive Index
1.461-1.485
Birefringence
0.024
Optic Character
Biaxial
Optic Sign
Negative
Hardness
4
Streak
white
Specific Gravity
2.713-2.730
Toughness
Poor
Luster
Vitreous
Fracture
conchoidal
Cleavage
perfect
Chemical Name
calcium aluminium sulfate fluoro hydroxide
Chemical Formula
Ca3SO4Al2F8(OH)2*2H2O
Crystal System
Monoclinic
Chemistry Classification
Halide
Creedite Colors
-
Orange -
White -
Blue -
Colorless -
Purple
Countries of Origin
Greece; Unknown; China; United States of America; Italy; Mexico; South Africa; Australia; France; Kazakhstan; Tajikistan; Bolivia (Plurinational State of)
Care
Creedite is brittle so please take care when handling specimens.