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Creedite

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Formula:
Ca3SO4Al2F8(OH)2 · 2H2O
System:
Monoclinic
Colour:
white, violet, ...
Lustre:
Vitreous
Hardness:
4
Name:
After the type locality, in the Creede quadrangle, Colorado.
A complex aluminium salt.

Visit gemdat.org for gemological information about Creedite.

Classification of Creedite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
mindat.org URL:
http://www.mindat.org/min-1151.html
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Type Occurrence of Creedite

Year of Discovery:
1916
Geological Setting of Type Material:
Upper portions of a fluorite-baryte vein.
Associated Minerals at Type Locality:

Physical Properties of Creedite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
white, violet, colourless; colourless in transmitted light.
Streak:
white
Hardness (Mohs):
4
Tenacity:
Brittle
Cleavage:
Perfect
On {100}.
Fracture:
Conchoidal
Density:
2.713 - 2.73 g/cm3 (Measured)    2.715 g/cm3 (Calculated)

Crystallography of Creedite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group 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 Volume:
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, veruginous masses; embedded grains and crystals.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.3 (9)
6.9 (9)
5.79 (8)
3.92 (9)
3.48 (10)
3.07 (8)
2.161 (9)

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.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemical Properties of Creedite

Formula:
Ca3SO4Al2F8(OH)2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Creedite to other Species

3.CG.05Stenonite(Sr,Ba,Na)2Al(CO3)F5
3.CG.10Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2O
3.CG.10Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2O
3.CG.10MeniayloviteCa4[F|SO4|SiF6|AlF6] · 12H2O
3.CG.10Chukhrovite-(Nd)Ca3(Nd,Y)Al2(SO4)F13·12H2O
3.CG.20BøggilditeNa2Sr2Al2PO4F9
3.CG.25ThermessaiteK2(AlF3)(SO4)
26.1KogarkoiteNa3(SO4)F
26.2SulphohaliteNa6(SO4)2FCl
26.3SchaireriteNa3(SO4)(F,Cl)
26.4GaleiteNa15(SO4)5F4Cl
26.5ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
26.6ChlorothioniteK2Cu(SO4)Cl2
26.7KamchatkiteKCu3(SO4)2OCl
26.8SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
26.9AubertiteCuAl(SO4)2Cl · 14H2O
26.10Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
26.11Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O
26.12D'AnsiteNa21Mg(SO4)10Cl3
26.13AnhydrokainiteKMg(SO4)Cl
26.14KainiteKMg(SO4)Cl · 3H2O
26.15Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
26.16Kleinite(Hg2N)(Cl,SO4) · nH2O
26.17WilcoxiteMgAl(SO4)2F · 17H2O
26.19LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O
26.20Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2O
26.21Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2O
26.22GrandreefitePb2(SO4)F2
26.23PseudograndreefitePb6(SO4)F10
26.24SundiusitePb10(SO4)O8Cl2
26.25CaracoliteNa3Pb2(SO4)3Cl
26.26MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2
26.27AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3Cl
26.28XitieshaniteFe3+(SO4)Cl · 6H2O
26.29NabokoiteKCu7(SO4)5(Te4+O3)OCl

Other Names for Creedite

Name in Other Languages:
Dutch:Creediet
Italian:Creedite
Russian:Кридит
Simplified Chinese:铝氟石膏
Traditional Chinese:氟鋁石膏

Other Information

Other Information:
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.

References for Creedite

Reference List:
Larsen and Wells (1916) Proceedings of the National Academy of Sciences, Washington: 2: 360.

Foshag, W.F. (1922): The crystallography and chemical composition of creedite. Proceedings of the U.S. National Museum 59, 419-424.

American Mineralogist (1932): 17: 75.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 129-130.

Giuseppetti, G. and Tadini, C. (1983): Structural analysis and refinement of Bolivian creedite, Ca3Al2F8(OH)2(SO4)•2H2O. Neues Jahrbuch für Mineralogie, Monatshefte 1983, 69-78.

Robert Cook (2008) Connoisseur's Choice Creedite Cresson Mine, Cripple Creek, Teller County, Colorado. Rocks & Minerals 81:5 422-426

Internet Links for Creedite

Specimens:
The following Creedite specimens are currently listed for sale on minfind.com.

Localities for Creedite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Queensland
    • Mount Isa - Cloncurry area
      • Cloncurry District
I.D. by Peter Elliott
Bolivia
 
  • La Paz Department
    • Inquisivi Province
      • Colquiri
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 130.
  • Potosí Department
    • Rafael Bustillo Province (Bustillos Province)
      • Llallagua
Mineralogical Record: 32: 474.; Hyrsl, J. & A. Petrov (2006): Famous Mineral Localities: Llallagua, Bolivia. Mineralogical Record. 37: 117-162
China
 
  • Guizhou Province
    • Qianxi'nan Autonomous Prefecture
      • Qinglong Co.
        • Dachang Sb ore field
www.johnbetts-fineminerals.com + Ottens, B. (2006): Antimonit aus China. LAPIS 31 (2), 23-34
  • Hunan Province
    • Loudi Prefecture
      • Lengshuijiang Co.
Mingyue He, Ya'er Lou, and Pu Wang (2002): Mineral Deposits 21(suppl.), 384-387
France
 
  • Alsace
    • Haut-Rhin
      • Ribeauvillé
        • Bergheim
J.-L. Hohl: "Minéraux et Mines du Massif Vosgien", Editions du Rhin (Mulhouse), 1994
        • Orschwiller
J.-L. Hohl: "Minéraux et Mines du Massif Vosgien", Editions du Rhin (Mulhouse), 1994
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
LAPIS 24 (7/8) 1999; Wendel, W. and Markl, G. (1999) Lavrion: Mineralogische Klassiker und Raritäten für Sammler. LAPIS 24 (7/8):34-52
No reference listed
        • Sounion area
          • Sounion Mines
Lapis, 24, 7/8 (1999)
      • Lavrion District slag localities
        • Sounion area
Schnorrer-Köhler, G., Standfuss, K. & Standfuss, L. (1985): Neue Schlackenmineralien von Lavrion. Lapis, 10 (5), 13-16; 50.
Italy
 
  • Sardinia
    • Nuoro Province
      • Gadoni
Stara, P., Rizzo, R., Sabelli, C., Ibba, A. (1999): I minerali di Funtana Raminosa. Rivista Mineralogica Italiana, 1/1999, 10-27.
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
SEM-EDX quantitative analysis - M.E.Ciriotti 2011
  • Tuscany
    • Livorno Province
      • Campiglia Marittima
Jansen, H. & van den Berg, W. (1998): Slakkenmineralen in Toscane (Italië). Gea, no. 4, 109-117 (in Dutch).
Kazakhstan
 
  • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
    • Öskemen (Ust'-Kamenogorsk)
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Akchatau (Aqshatau; Akschatau; Akchataul; Akshatau)
Rocks & Minerals 81:5 422-426; Cooper, Michael P.(1997) What’s New in Minerals, Munich Show 1996. Mineralogical Record 28:137; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
    • Betpakdala Desert (Bet-Pak-Dal Desert)
Rocks & Minerals 81:5 422-426; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Pautov et al (2005) New Data on Minerals Vol 40 pp5-10; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
    • Kayrakty (Kairakty)
Laznicka, P. (2010): Giant Metallic Deposits, 2nd ed. Springer (Berlin, Heidelberg), p. 237.
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
Mexico
 
  • Chihuahua
Personal collecting experience
        • East Camp
Megaw, P.K.M., 1990b, Geology and geochemistry of the Santa Eulalia mining district, Chihuahua, Mexico.: Unpublished Ph.D. Thesis, Univ. of Arizona, 549 p
No reference listed
          • Aquiles Serdán
Panczner (1987): 150, 210, 220.
          • Francisco Portillo
Panczner(1987):172.
Panczner(1987):172.
Panczner (1987):94-366.
  • Durango
    • Mun. de Rodeo
      • Rodeo
        • Abasolo
Rocks & Minerals 83:5 pp 422-426; Rob Lavinsky
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Kuruman
        • N'Chwaning Mines
[Von Bezing, K. L. et al. (1991) - The Kalahari (Afrique du Sud) manganese field : an update, Mineralogical Record, 22 (3), 279-302.]
Minerals of South Africa
Tajikistan
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
    • Pamir Mts
Rocks & Minerals 81:5 422-426
USA
 
  • Arizona
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Aravaipa
            • Landsman Camp (Landsman group)
Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.
          • Klondyke
            • Grand Reef Mountain
              • Laurel Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 192.
  • California
    • Inyo Co.
      • Darwin Hills
MinRec 15:5
          • Darwin
Pabst, Adolf (1952), A new locality for creedite: Rocks & Minerals: 27: 19; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 190.
Rocks & Minerals 83:5 pp 422-426
Rocks & Minerals 83:5 pp 422-426
      • Panamint Mts (Panamint Range)
        • Panamint District (Ballarat District)
          • Panamint (old Panamint)
Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: Calif Division of Mines Special Report 51, 77 pp.: 18; Hall, Wayne Everett & Edward M. Mackevett (1963), Geology and ore deposits of the Darwin quadrangle, Inyo County, California: USGS PP 368: 64; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 162.
  • Colorado
    • Clear Creek Co.
      • Dailey District (Jones Pass District)
Rocks & Minerals 83:5 pp 422-426
    • Mineral Co.
      • Wagon Wheel Gap
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 130; "Minerals of Colorado, updated & revised", p. 172, by Eckel, Edwin B., 1997; Rocks & Min.:10:84-85.
    • Teller Co.
      • Cripple Creek District
        • Cripple Creek
Min Rec 36:2 pp143-185; 2009 New Mexico Mineral Symposium abstracts
  • Nevada
    • Churchill Co.
      • Lake District
NBMG Spec. Pub. 31 Minerals of Nevada
      • Mountain Wells District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Douglas Co.
      • Wellington Hills
        • Silver Glance District (Wellington District)
NBMG Spec. Pub. 31 Minerals of Nevada
    • Esmeralda Co.
Rocks & Minerals, Nov. 1999
      • Rock Hill District
NBMG Spec. Pub. 31 Minerals of Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
      • Iron Point District
        • Valmy
Dr. William S. Wise presentation to Northwest Micro Mineral Study Group on 1 May 2004, Update on Mineralogy of the Silver Coin Mine, Iron Point District, Edna Mountains, Humboldt Co., Nevada
    • Nye Co.
      • Lodi Hills
        • Lodi District
          • Granite camp
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 130; NBMG Spec. Pub. 31 Minerals of Nevada
      • San Antonio Mts
        • San Antone District
NBMG Spec. Pub. 31 Minerals of Nevada
        • Tonopah District
Knut Edvard Larsen collection # MM-657; Henderson, B. (1986): Microminerals. Mineralogical Record, 17 (4), 272
  • New Mexico
    • Socorro Co.
Northrop, Minerals of New Mexico, 3rd Rev. ed., 1996
        • Bingham
Minerals of New Mexico 3rd ed.
[MinRecord 30:337]
Mineral and/or Locality  
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