Creedite Value, Price, and Jewelry Information


CREEDITE: Chihuahua, Mexico (0.96). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Creedite is one of the very rare minerals known to collectors. It may well be that less than a dozen creedite gems have ever been cut. The mineral itself is rare, cuttable crystals even more so. These would be colorless or purple and from the Mexican occurrence. The hardness is too low for wear - strictly a collector gem.

Creedite Value

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Creedite Information

DataValue
NameCreedite
Crystallography Monoclinic. Crystals short, prismatic; also radial clusters.
Colors Colorless, white, rose to lilac or purple.
Luster Vitreous.
Fracture Fracture conchoidal. Brittle.
Hardness 4
Specific Gravity 2.71 -2.73
Birefringence 0.024
Cleavage Perfect 1 direction.
Dispersion Moderate
Stone SizesFaceted gems very small, usually less than 1-2 carats. Private Collection: 0.96 (purple, Chihuahua).
Luminescence Medium white to cream color (SW); bright white to cream (LW).
Spectral Not diagnostic.
FormulaCa­3AI2(SO4)(F,OH)10 • 2H2O.

Optics:  a= 1.461; β = 1.478; γ= 1.485. Biaxial (-), 2V= 64°.

Darwin, California; Granite, Nevada. Colquiri, Bolivia.

Creede, Colorado: in cavities in rock with fluorite and barite.

Wagon Wheel Gap, Colorado: in a fluorite-barite mine.

Santa Eulalia, Chihuahua, Mexico: in crystals up to 1 inch long, gemmy.

Comments: Creedite is one of the very rare minerals known to collectors. It may well be that less than a dozen creedite gems have ever been cut. The mineral itself is rare, cuttable crystals even more so. These would be colorless or purple and from the Mexican occurrence. The hardness is too low for wear – strictly a collector gem.

Name: Occurrence in the Creede Quadrangle, Colorado.