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Creedite
Current inventory:  2 gems
 

Chemistry:  Ca₃Al₂(SO₄)(F,OH)₁₀ · 2(H₂O)

Discovered in 1916;   IMA status: Valid (pre-IMA; Grandfathered).
Creedite is named after the type locality in the Creede quadrangle, Colorado, USA.

Classification

Mineral Classification:

Halides

Strunz 8th Ed. ID:

3/C.01-40

Nickel-Strunz 10th Ed. ID:

3.CG.15

3 : HALIDES
C : Complex halides
G : Aluminofluorides with CO₃, SO₄, PO₄

Crystal Data

Crystallography:

Monoclinic - Prismatic

Crystal Habit:

Crystals are prismatic, bladelike to acicular to 8 cm; radiating, drusy to granular aggregates.

Twinning:

None

Physical Properties

Cleavage:

[100] Perfect

Fracture:

Conchoidal

Tenacity:

Brittle

Moh's Hardness:

4.0

Density:

2.713 - 2.730 (g/cm³)

Radioactivity:

Not Radioactive

Optical Properties

Color:

Colorless to white, orange, purple

Transparency:

Transparent to Translucent

Luster:

Vitreous

Refractive Index:

1.461 - 1.485  Biaxial ( - )

Birefringence:

0.024

Dispersion:

Strong

Pleochroism:

Colorless

Occurances

Geological Setting:

Uncommon in fluorite-rich hydrothermal mineral deposits.

Type Locality:

Colorado Fluorspar Co. Mine, Wagon Wheel Gap, Mineral Co., Colorado, USA

Year Discovered:

1916

View mineral photos:

Creedite Mineral Photos and Locations

More Information

Mindat.org
Webmineral.com

Creedite is a very rare sulfate gem that was discovered near Creede, Colorado, USA. It is a complex aluminum salt found only in a few locations worldwide. Creedite is found as colorless, white, rose, lilac, purple and orange. Crystals are often in beautiful radial clusters.

The only known locations for gem quality crystals of Creedite are Aqshatau, Qaraghandy Oblysy, Kazakhstan; Santa Eulalia District, Chihuahua, Mexico; San Pedro Mine, Mapimí, Durango, Mexico; Navidad Mine, Rodeo, Durango, Mexico; Dal'negorsk, Primorskiy Kray, Far-Eastern Region, Russia; Hall's mine, San Antone District, Nye County, Nevada, USA.
 

  
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