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Fencooperite

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Big Photo

Incline Sanbornite deposit, Trumbull Peak, Incline, Mariposa Co., California, USA
© Maurice de Graaf




Formula:
Ba
 
6
Fe
3+
3
Si
 
8
O
 
23
(CO
 
3
)
 
2
Cl
 
3
 · H
 
2
O
System:TrigonalColour:Black
Hardness:4½ - 5
Name:Named for California mineral collector Fen Cooper.
This page provides mineralogical data about Fencooperite.

Classification of Fencooperite

IMA status:Approved 2000
Strunz 8th edition ID:8/C.37-10
Nickel-Strunz 10th (pending) edition ID:9.BH.20

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

Type Locality:Incline Sanbornite deposit, Trumbull Peak, Incline, Mariposa Co., California, USA

Physical Properties of Fencooperite

Lustre:Adamantine, Vitreous
Colour:Black
Streak:Greyish black
Hardness (Mohs):4½ - 5

Crystallography of Fencooperite

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

Optical Data of Fencooperite

Type:Isotropic (-)
RI values: nω = 1.723 nε = 1.711
Maximum Birefringence:δ = 0.012 - Isotropic minerals have no birefringence
Surface Relief:High

Chemical Properties of Fencooperite

Formula:
Ba
 
6
Fe
3+
3
Si
 
8
O
 
23
(CO
 
3
)
 
2
Cl
 
3
 · H
 
2
O
Essential elements:Ba, C, Cl, Fe, H, O, Si
All elements listed in formula:Ba, C, Cl, Fe, H, O, Si

Relationship of Fencooperite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BH.05Aminoffite
Ca
 
2
(Be,Al)(Si
 
2
O
 
7
)(H
 
2
O,OH)
9.BH.10Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
9.BH.15Akatoreite
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6

Other Names for Fencooperite

Synonyms:
IMA2000-023
Other Languages:
German:Fencooperit
Russian:Фенкуперит
Spanish:Fencooperita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fencooperite

Reference List:

- +
Canadian Mineralogist: 39, 1059-1064,

Grice, J.D. (2001) The crystal structure of fencooperite: Unique [Fe3O13] pinwheels cross-connected by [Si8O22] islands. Canadian Mineralogist: 39: 1065-1071.

Internet Links for Fencooperite

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    • Localities for Fencooperite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    USA
     
    • California
      • Fresno Co.
        • Big Creek-Rush Creek District
          • Rush Creek deposit
            • Big Creek
    		Can. Min. 39:1065-1071.
      • Mariposa Co.
        • Incline
          • Trumbull Peak
    		Canadian Mineralogist: 39(4): 1059
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