Creedite
A valid IMA mineral species - grandfathered
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About Creedite
Formula:
Ca3SO4Al2F8(OH)2 · 2H2O
Colour:
white, violet, purple, colourless, orange; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.713 - 2.73
Crystal System:
Monoclinic
Name:
After the type locality, in the Creede quadrangle, Colorado.
A complex aluminium salt. Compare the chemically related chukhrovite-(Ca) and kruijenite.
Visit gemdat.org for gemological information about Creedite.
Visit gemdat.org for gemological information about Creedite.Unique Identifiers
Mindat ID:
1151
Long-form identifier:
mindat:1:1:1151:4
GUID
(UUID V4):
(UUID V4):
afbaff0b-ce09-4dd4-9ff8-67292c372bc4
IMA Classification of Creedite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca3Al2(SO4)(OH)2F8 · 2H2O
First published:
1916
Classification of Creedite
3.CG.15
3 : HALIDES
C : Complex halides
G : Aluminofluorides with CO3, SO4, PO4
3 : HALIDES
C : Complex halides
G : Aluminofluorides with CO3, SO4, PO4
12.1.4.1
12 : COMPOUND HALIDES
1 : Miscellaneous
12 : COMPOUND HALIDES
1 : Miscellaneous
26.18
26 : Sulphates with Halide
26 : Sulphates with Halide
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cee | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Creedite
Vitreous
Transparency:
Transparent
Colour:
white, violet, purple, colourless, orange; colourless in transmitted light.
Streak:
white
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {100}.
On {100}.
Fracture:
Conchoidal
Density:
2.713 - 2.73 g/cm3 (Measured) 2.715 g/cm3 (Calculated)
Optical Data of Creedite
Type:
Biaxial (-)
RI values:
nα = 1.461 nβ = 1.478 nγ = 1.485
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Creedite
Mindat Formula:
Ca3SO4Al2F8(OH)2 · 2H2O
Crystallography of Creedite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 13.936(1) Å, b = 8.606(1) Å, c = 9.985(1) Å
β = 94.39(1)°
β = 94.39(1)°
Ratio:
a:b:c = 1.619 : 1 : 1.16
Unit Cell V:
1,194.02 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals short prismatic to acicular [001]; commonly with {111} and {111} or {111} alone as the dominant terminal forms. Crystals may measure up to 8 cm. Radiated aggregates; drusy, masses; embedded grains and crystals.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014772 | Creedite | Giuseppetti G, Tadini C (1983) Structural analysis and refinement of Bolivian creedite, Ca3Al2F8(OH)2(SO4)*2(H2O): The role of the hydrogen atoms Neues Jahrbuch fur Mineralogie, Monatshefte 1983 69-78 | 1983 | Tin mines of the Catavi (Llallagua) zone, Bolivia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
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Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.3 Å | (9) |
| 6.9 Å | (9) |
| 5.79 Å | (8) |
| 3.92 Å | (9) |
| 3.48 Å | (10) |
| 3.07 Å | (8) |
| 2.161 Å | (9) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 56 : Slag and smelter minerals (see also #51 and #55) |
Type Occurrence of Creedite
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, number 81273.
National Museum of Natural History, Washington, D.C., USA, numbers 93117, C1034.
National Museum of Natural History, Washington, D.C., USA, numbers 93117, C1034.
Geological Setting of Type Material:
Upper portions of a fluorite-baryte vein.
Associated Minerals at Type Locality:
Reference:
Larsen, E.S., Wells, R.C. (1916) Some minerals from the fluorite-barite vein near Wagon Wheel Gap, Colorado. Proceedings of the National Academy of Sciences: 2: 360-365.
Synonyms of Creedite
Other Language Names for Creedite
Dutch:Creediet
German:Belijankit
Belyankit
Creedit
Belyankit
Creedit
Italian:Creedite
Russian:Кридит
Simplified Chinese:铝氟石膏
Spanish:Belyankita
Creedita
Creedita
Traditional Chinese:氟鋁石膏
Common Associates
Associated Minerals Based on Photo Data:
| 180 photos of Creedite associated with Fluorite | CaF2 |
| 21 photos of Creedite associated with Gearksutite | Ca[Al(F,OH)5(H2O)] |
| 18 photos of Creedite associated with Quartz | SiO2 |
| 14 photos of Creedite associated with Smithsonite | ZnCO3 |
| 8 photos of Creedite associated with Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O |
| 8 photos of Creedite associated with Allophane | (Al2O3)(SiO2)1.3-2 · 2.5-3H2O |
| 7 photos of Creedite associated with Pyrite | FeS2 |
| 5 photos of Creedite associated with Spangolite | Cu6Al(SO4)(OH)12Cl · 3H2O |
| 5 photos of Creedite associated with Opal-AN | SiO2 · nH2O |
| 5 photos of Creedite associated with Chalcedony | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 3.CG.3.CG. | Chukhrovite-(Ca) | Ca4.5Al2(SO4)F13 · 12H2O |
| 3.CG.05 | Stenonite | (Sr,Ba,Na)2Al(CO3)F5 |
| 3.CG.10 | Chukhrovite-(Ce) | Ca3(Ce,Y)(AlF6)2(SO4)F · 10H2O |
| 3.CG.10 | Chukhrovite-(Y) | Ca3(Y,Ce)(AlF6)2(SO4)F · 10H2O |
| 3.CG.10 | Meniaylovite | Ca4[(SO4)(SiF6)(AlF6)]F · 12H2O |
| 3.CG.10 | Chukhrovite-(Nd) | Ca3(Nd,Y)Al2(SO4)F13 · 12H2O |
| 3.CG.20 | Bøggildite | Na2Sr2Al2PO4F9 |
| 3.CG.25 | Thermessaite-(NH4) | (NH4)2AlF3(SO4) |
| 3.CG.25 | Thermessaite | K2AlF3(SO4) |
| 3.CG.30 | Kruijenite | Ca4Al4(SO4)F2(OH)16 · 2H2O |
Other Information
Notes:
Slowly soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Creedite
mindat.org URL:
https://www.mindat.org/min-1151.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Creedite
Reference List:
Lane, M. D. (2007) Mid-infrared emission spectroscopy of sulfate and sulfate-bearing minerals. American Mineralogist, 92 (1) 1-18 doi:10.2138/am.2007.2170
Localities for Creedite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Morello et al. (2016) |
Australia | |
| I.D. by Peter Elliott |
Bolivia | |
| Palache et al. (1951) |
| Mineralogical Record: 32: 474. +1 other reference |
China | |
| Ottens (2006) |
| Mingyue He et al. (2002) |
France | |
| J.-L. Hohl: "Minéraux et Mines du Massif Vosgien" (Mulhouse) |
| J.-L. Hohl: "Minéraux et Mines du Massif Vosgien" (Mulhouse) |
Greece | |
| |
| LAPIS 24 (7/8) +1 other reference | |
| Rieck et al. (2018) |
| Branko Rieck collection |
| Lapis et al. (1999) |
| 50. +1 other reference |
Italy | |
| Campostrini et al. (2019) |
| Campostrini et al. (2019) |
| Campostrini et al. (2019) | |
| Stara et al. (1999) |
| SEM-EDX quantitative analysis - ... |
| Jansen et al. (1998) |
Kazakhstan | |
| Bailey |
| |
| Rocks & Minerals 81:5 422-426 +3 other references |
| Rocks & Minerals 81:5 422-426 +2 other references |
| Laznicka (2010) |
| Evseev (1995) | |
Mexico | |
| Personal collecting experience |
| Megaw |
| Panczner (1987) |
| Panczner (1987) | |
| Panczner (1987) | |
| Gerardo Perez Reveles Collection |
| Rocks & Minerals 83:5 pp 422-426 +1 other reference |
South Africa | |
| Von Bezing et al. (1991) |
| Cairncross et al. (1995) | |
Tajikistan | |
| Rocks & Minerals 81:5 422-426 |
USA | |
| Wilson (1988) |
| Anthony et al. (1995) |
| Stolburg (1984) |
| Van Nostrand Reinholt Press: 190. +2 other references |
| Rocks & Minerals 83:5 pp 422-426 | |
| Rocks & Minerals 83:5 pp 422-426 | |
| Hall (1958) +2 other references |
| Housley et al. (1999) |
| Rocks & Minerals 83:5 pp 422-426 |
| Rocks & Min.:10:84-85. +2 other references |
| 2009 New Mexico Mineral Symposium ... +1 other reference |
| Castor et al. (2004) |
| Walstrom (n.d.) +1 other reference |
| Walstrom (n.d.) +1 other reference |
| Rocks & Minerals |
| Castor et al. (2004) |
| Castor et al. (2004) | |
| Dr. William S. Wise presentation to ... +1 other reference |
| Palache et al. (1951) +1 other reference |
| Castor et al. (2004) |
| Knut Edvard Larsen collection # MM-657 +1 other reference |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| [Mineralogical Record 30:337] |
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Qinglong County, Qianxinan, Guizhou, China