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Fencooperite

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About FencooperiteHide

Fen Cooper
Formula:
Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O
Colour:
Black
Lustre:
Adamantine, Vitreous
Hardness:
4½ - 5
Crystal System:
Trigonal
Name:
Named for California mineral collector Joseph Fenimore Cooper, Jr. (April 30, 1937, Santa Cruz, California - June 6, 2017, Santa Cruz, California). He was an avid collector of western U.S. minerals, especially in California and Nevada, and contributed to more than twenty publications.
This page provides mineralogical data about Fencooperite.


Classification of FencooperiteHide

Approved
Approval Year:
2000
9.BH.20

9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination

Physical Properties of FencooperiteHide

Adamantine, Vitreous
Colour:
Black
Streak:
Greyish black
Hardness:
4½ - 5 on Mohs scale

Optical Data of FencooperiteHide

Type:
Isotropic (-)
RI values:
nω = 1.723 nε = 1.711
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
High

Chemical Properties of FencooperiteHide

Formula:
Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O

Crystallography of FencooperiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3m1
Cell Parameters:
a = 10.727 Å, c = 7.085 Å
Ratio:
a:c = 1 : 0.66
Unit Cell V:
706.1 ų

Type Occurrence of FencooperiteHide

Place of Conservation of Type Material:
National Mineral Collection at the Geological Survey of Canada, Ottawa.

Synonyms of FencooperiteHide

Other Language Names for FencooperiteHide

Simplified Chinese:氯碳硅铁钡石
Spanish:Fencooperita
Traditional Chinese:氯碳矽鐵鋇石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sanbornite1 photo of Fencooperite associated with Sanbornite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BH.05AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)Tet.
9.BH.10KinoiteCa2Cu2(H2O)2[Si3O10]Mon. 2/m : P21/m
9.BH.15AkatoreiteMn2+9Al2Si8O24(OH)8Tric.

Other InformationHide

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 FencooperiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Grice, J.D., Dunning, G.E., and Venance, K.E. (2001) Fencooperite, Ba6Fe33+Si8O23(CO3)2Cl3·H2O, a new mineral species from Trumbull Peak, Mariposa County, California. Canadian Mineralogist: 39: 1059–1064.
Grice, J.D. (2001) The crystal structure of fencooperite: Unique [Fe33+O13] pinwheels cross-connected by [Si8O22] islands. Canadian Mineralogist: 39: 1065-1071.
Jambor, J.L. and Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 765-768.

Internet Links for FencooperiteHide

Localities for FencooperiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
          • Big Creek
Grice, J.D. (2001) The crystal structure of fencooperite: Unique [Fe33+O13] pinwheels cross-connected by [Si8O22] islands. Canadian Mineralogist: 39: 1065-1071.; Jambor, J.L. and Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 765-768.
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
Roberts, A.C., Grice, J.D., Dunning, G.E., and Venance, K.E. (2001) Fencooperite, Ba6Fe33+Si8O23(CO3)2Cl3·H2O, a new mineral species from Trumbull Peak, Mariposa County, California. Canadian Mineralogist: 39: 1059–1064.; Jambor, J.L. and Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 765-768.
Mineral and/or Locality  
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