General Information
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 Chemical Formula: |
Ca3Al2(SO4)(F,OH)10·2(H2O) |
| Composition: |
Molecular Weight = 491.30 gm) |
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| Empirical Formula: |
Ca3Al2(SO4)F7.5(OH)2.5·2(H2O) |
| Locality: |
Wagon Wheel Gap, Creed Quadrangle, Colorado, USA. |
| Name Origin: |
Named after its locality. |
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Creedite Image
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Images: |
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Creedite crystals to 1.4 cm in length. Mina Navidad, Durango, Mexico.
Photo by John Veevaert |
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Classification
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| Dana Class: |
12.1.4.1 (12)Compound Halides |
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(12.1)with miscellaneous anions |
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(12.1.4)Dana Group |
| Strunz Class: |
III/C.01-40 III - Halogenides |
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III/C - Double halogenides with water, Fluorides |
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III/C.01 - Gearksutite - Chukhrovite - (Ce) series |
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Crystallography
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| Axial Ratios: |
a:b:c =1.5046:1:1.1655 |
| Cell Dimensions: |
a = 12.91, b = 8.58, c = 10, Z = 4; beta = 94.4ø V = 1,104.41 Den(Calc)= 2.95 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.48(1) 6.9(0.9) 7.3(0.9) |
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Physical Properties
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| Cleavage: |
[100] Perfect |
| Color: |
colorless, violet, or white. |
| Density: |
2.71 |
| Diaphaniety: |
Transparent to translucent |
| Habits: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Prismatic - Crystals Shaped like Slender Prisms (e.g. tourma |
| Hardness: |
3.5 - Copper Penny |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Vitreous - Greasy |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.461, b=1.478, g=1.485, bire=0.0240 |
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Other Information
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other data for Creedite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -The Mineral Gallery
6 -WWW-MINCRYST
7 -École des Mines de Paris
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