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Creedite

A valid IMA mineral species - grandfathered
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About CreediteHide

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.




Unique IdentifiersHide

Mindat ID:
1151
Long-form identifier:
mindat:1:1:1151:4
GUID
(UUID V4):
afbaff0b-ce09-4dd4-9ff8-67292c372bc4

IMA Classification of CreediteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca3Al2(SO4)(OH)2F8 · 2H2O
First published:
1916

Classification of CreediteHide

3.CG.15

3 : HALIDES
C : Complex halides
G : Aluminofluorides with CO3, SO4, PO4
12.1.4.1

12 : COMPOUND HALIDES
1 : Miscellaneous
26.18

26 : Sulphates with Halide

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CeeIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CreediteHide

Vitreous
Transparency:
Transparent
Colour:
white, violet, purple, colourless, orange; colourless in transmitted light.
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
On {100}.
Fracture:
Conchoidal
Density:
2.713 - 2.73 g/cm3 (Measured)    2.715 g/cm3 (Calculated)

Optical Data of CreediteHide

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.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemistry of CreediteHide

Mindat Formula:
Ca3SO4Al2F8(OH)2 · 2H2O

Crystallography of CreediteHide

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)°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014772CreediteGiuseppetti 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 69-781983Tin mines of the Catavi (Llallagua) zone, Bolivia0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Type Occurrence of CreediteHide

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.
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 CreediteHide

Other Language Names for CreediteHide

Dutch:Creediet
Italian:Creedite
Russian:Кридит
Simplified Chinese:铝氟石膏
Traditional Chinese:氟鋁石膏

Common AssociatesHide

Associated Minerals Based on Photo Data:
176 photos of Creedite associated with FluoriteCaF2
21 photos of Creedite associated with GearksutiteCa[Al(F,OH)5(H2O)]
17 photos of Creedite associated with QuartzSiO2
14 photos of Creedite associated with SmithsoniteZnCO3
8 photos of Creedite associated with Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
7 photos of Creedite associated with CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2O
6 photos of Creedite associated with PyriteFeS2
5 photos of Creedite associated with SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
5 photos of Creedite associated with ChalcedonySiO2
5 photos of Creedite associated with Opal-ANSiO2 · nH2O

Related Minerals - Strunz-mindat GroupingHide

3.CG.3.CG.Chukhrovite-(Ca)Ca4.5Al2(SO4)F13 · 12H2OIso. m3 (2/m 3) : Fd3
3.CG.05Stenonite(Sr,Ba,Na)2Al(CO3)F5Mon. 2/m
3.CG.10Chukhrovite-(Ce)Ca3(Ce,Y)(AlF6)2(SO4)F · 10H2OIso.
3.CG.10Chukhrovite-(Y)Ca3(Y,Ce)(AlF6)2(SO4)F · 10H2OIso. m3 (2/m 3) : Fd3
3.CG.10MeniayloviteCa4[(SO4)(SiF6)(AlF6)]F · 12H2OIso. m3 (2/m 3) : Fd3
3.CG.10Chukhrovite-(Nd)Ca3(Nd,Y)Al2(SO4)F13 · 12H2OIso. m3 (2/m 3) : Fd3
3.CG.20BøggilditeNa2Sr2Al2PO4F9Mon. 2/m : P21/b
3.CG.25Thermessaite-(NH4)(NH4)2AlF3(SO4)Orth. mmm (2/m 2/m 2/m) : Pbcn
3.CG.25ThermessaiteK2AlF3(SO4)Orth. mmm (2/m 2/m 2/m) : Pbcn
3.CG.30KruijeniteCa4Al4(SO4)F2(OH)16 · 2H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nnc

Other InformationHide

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 CreediteHide

References for CreediteHide

Reference List:

Localities for CreediteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Catamarca Province
    • Tinogasta Department
      • Fiambalá
Morello et al. (2016)
Australia
 
  • Queensland
    • Cloncurry Shire
      • Cloncurry
I.D. by Peter Elliott
Bolivia
 
  • La Paz
    • Inquisivi Province
      • Colquiri
Palache et al. (1951)
  • Potosí
    • Rafael Bustillo Province
      • Llallagua
Mineralogical Record: 32: 474. +1 other reference
China
 
  • Guizhou
    • Qianxinan
      • Qinglong County
        • Dachang Sb ore field
Ottens (2006)
  • Hunan
    • Loudi
      • Lengshuijiang Co.
Mingyue He et al. (2002)
France
 
  • Grand Est
    • Bas-Rhin
      • Sélestat-Erstein
        • Orschwiller
J.-L. Hohl: "Minéraux et Mines du Massif Vosgien" (Mulhouse)
    • Haut-Rhin
      • Colmar-Ribeauvillé
        • Bergheim
J.-L. Hohl: "Minéraux et Mines du Massif Vosgien" (Mulhouse)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion Mining District
          • Agios Konstantinos (Kamariza)
LAPIS 24 (7/8) +1 other reference
            • Mercati mines
Rieck et al. (2018)
          • Legrena Valley
            • Megala Pefka Mines
Branko Rieck collection
          • Sounion
            • Cato Sounio mines
Lapis et al. (1999)
        • Lavrion slag localities
50. +1 other reference
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
        • Mount Vesuvius
Campostrini et al. (2019)
        • Ottaviano
Campostrini et al. (2019)
Campostrini et al. (2019)
  • Sardinia
    • Nuoro Province
      • Gadoni
Stara et al. (1999)
  • Sicily
    • Metropolitan City of Messina
      • Eolie Islands (Aeolian Islands)
        • Lipari
SEM-EDX quantitative analysis - ...
  • Tuscany
    • Livorno Province
      • Campiglia Marittima
Jansen et al. (1998)
Kazakhstan
 
  • Abai Region
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Bailey
  • East Kazakhstan Region
    • Oskemen
  • Jambyl Region
    • Moiynkum District
Rocks & Minerals 81:5 422-426 +3 other references
  • Karaganda Region
    • Shet District
      • Akshatau (Aqshatau)
Rocks & Minerals 81:5 422-426 +2 other references
      • Kayrakty (Kairakty)
Laznicka (2010)
Evseev (1995)
Mexico
 
  • Chihuahua
Personal collecting experience
        • East Camp
Megaw
          • Francisco Portillo
Panczner (1987)
Panczner (1987)
Panczner (1987)
    • Manuel Benavides Municipality
Gerardo Perez Reveles Collection
  • Durango
    • Indé Municipality
Rocks & Minerals 83:5 pp 422-426 +1 other reference
South Africa
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • N'Chwaning Mines
Von Bezing et al. (1991)
Cairncross et al. (1995)
Tajikistan
 
  • Gorno-Badakhshan
Rocks & Minerals 81:5 422-426
USA
 
  • Arizona
    • Graham County
      • Aravaipa Mining District
        • Aravaipa
          • Landsman Camp
Wilson (1988)
        • Klondyke
          • Grand Reef Mountain
            • Laurel Canyon
Anthony et al. (1995)
  • California
    • Inyo County
      • Darwin Hills
Stolburg (1984)
          • Darwin
Van Nostrand Reinholt Press: 190. +2 other references
Rocks & Minerals 83:5 pp 422-426
Rocks & Minerals 83:5 pp 422-426
      • Panamint Mts (Panamint Range)
        • Panamint Mining District (Ballarat Mining District)
          • Panamint (old Panamint)
Hall (1958) +2 other references
    • San Bernardino County
      • Ord Mining District
        • Ord Mountains
          • Ord Mountain
            • Ord Mountain Mine (Ord Mountain Mine System; Ord Mine; Ord Mountain deposits; Osborn; Rio Vista claim; Brilliant claim; Josephine claim; Belgium claim; Copper Junction claim)
Housley et al. (1999)
  • Colorado
    • Clear Creek County
      • Dailey Mining District (Jones Pass Mining District)
Rocks & Minerals 83:5 pp 422-426
    • Mineral County
      • Wagon Wheel Gap
Rocks & Min.:10:84-85. +2 other references
    • Teller County
      • Cripple Creek Mining District
        • Cripple Creek
2009 New Mexico Mineral Symposium ... +1 other reference
  • Nevada
    • Churchill County
      • Lake Mining District
Castor et al. (2004)
      • Mountain Wells Mining District
Walstrom (n.d.) +1 other reference
    • Douglas County
      • Wellington Hills
        • Silver Glance Mining District (Wellington Mining District)
          • Wellington
Walstrom (n.d.) +1 other reference
    • Esmeralda County
Rocks & Minerals
      • Rock Hill Mining District
Castor et al. (2004)
Castor et al. (2004)
    • Humboldt County
      • Iron Point Mining District
        • Valmy
Dr. William S. Wise presentation to ... +1 other reference
    • Nye County
      • Lodi Hills
        • Lodi Mining District
          • Granite camp
Palache et al. (1951) +1 other reference
      • San Antonio Mountains
        • San Antone Mining District
Castor et al. (2004)
        • Tonopah Mining District
Knut Edvard Larsen collection # MM-657 +1 other reference
  • New Mexico
    • Socorro County
Northrop et al. (1996)
        • Bingham
Northrop et al. (1996)
[Mineralogical Record 30:337]
 
Mineral and/or Locality  
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