Item Description
The Creedite from this particular mine is often accompanied by purple Fluorite. However, this fascinating specimen also contains inclusions of an unknown variety - even a large protruding "dragon tooth" inclusion.
By far, it's one of the most interesting Creedite pieces we've seen. It can also be turned the opposite way to resemble a shake-n-bake chicken thigh. There's a little something for everyone in this stone!
Creedite
Stone of the Light
Properties of Creedite
Physical Properties
Category:
Halides
Chemical Formula:
Ca3SO4Al2F8(OH)2•2H2O
Crystal Class:
Prismatic
Crystal System:
Monoclinic
Name:
Creedite
Space Group:
C2/c
Strunz Classification:
3.CG.15
Unit Cell:
a = 13.91 Å, b = 8.58 Å, c = 10 Å; β = 94.4°; Z = 4
Mineral Identification
Birefringence: δ = 0.024
Cleavage: Perfect {100}
Common Colors: Colorless, Orange, Purple
Diaphaneity: Transparent to translucent
Fracture: Conchoidal
Luster: Vitreous
Mohs Hardness: 4
Optical Properties: Biaxial (-)
Refractive Index: nα = 1.461 nβ = 1.478 nγ = 1.485
Streak: White
Tenacity: Brittle
