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Fencooperite

A valid IMA mineral species
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Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O
Colour:
Jet black to a dirty grey-brown (on very thin edges)
Lustre:
Adamantine, Vitreous
Hardness:
4½ - 5
Specific Gravity:
4.212 (Calculated)
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.
Type Locality:
ⓘTrumbull Peak Ba-silicate deposit, Trumbull Peak, Clearing House, Clearing House Mining District, East Belt, Mariposa County, California, USA
This page provides mineralogical data about Fencooperite.


Unique Identifiers
Approval year:
2000
First published:
2001

Classification of Fencooperite

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

Mineral Symbols
Colour:
Jet black to a dirty grey-brown (on very thin edges)
Streak:
Greyish black
Hardness:
4½ - 5 onMohs scale
Hardness:
VHN10=269 - 367 kg/mm2 - Vickers
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.212 g/cm3 (Calculated)
Comment:
Dcalc 4.212 (empirical formula) and 4.338 (ideal formula). Density could not be measured due to small grain size and lack of pure material.

Optical Data of Fencooperite
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
Very strongly pleochroic.
nω = deep bluish-black
nε = light greenish-gray
Comments:
Absorption: O>>E.

Chemistry of Fencooperite

Crystallography of Fencooperite
General Appearance of Type Material:
A dominant phase within black aggregates 2 mm across in barium-silicate-rich lenses. Individual grains are anhedral to somewhat rounded to occasionally platy, and do not exceed 100 µm in size.
Place of Conservation of Type Material:
National Mineral Collection at the Geological Survey of Canada, Ottawa, Ontario, Canada.
Associated Minerals at Type Locality:
BaryteAlforsiteCelsianGillespiteQuartz
PyrrhotiteSanbornite

Synonyms of Fencooperite

Other Language Names for Fencooperite

Common AssociatesTric.1 :P19.BH.05AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)Tet. 4/m :P42/n9.BH.10KinoiteCa2Cu2(H2O)2[Si3O10]Mon. 2/m :P21/m9.BH.15AkatoreiteMn2+9Al2Si8O24(OH)8Tric.1 :P1

Fluorescence of Fencooperite

Other Information
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  • Raman and XRD data at RRUFF project
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    • References for FencooperiteⓘEsquire No. 7 claimWalstrom (n.d.)+2 other referencesRoberts et al. (2001)+1 other reference
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