Fencooperite
A valid IMA mineral species
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About Fencooperite
Formula:
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.
This page provides mineralogical data about Fencooperite.
Unique Identifiers
Mindat ID:
10343
Long-form identifier:
mindat:1:1:10343:7
GUID
(UUID V4):
(UUID V4):
ef22c70f-4ed7-4335-b8d8-1789d5e90943
IMA Classification of Fencooperite
Classification of Fencooperite
9.BH.20
9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Fco | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Fencooperite
Adamantine, Vitreous
Colour:
Jet black to a dirty grey-brown (on very thin edges)
Streak:
Greyish black
Hardness:
4½ - 5 on Mohs 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
Type:
Uniaxial (-)
RI values:
nω = 1.723 nε = 1.711
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Strong
Comments:
Very strongly pleochroic.
nω = deep bluish-black
nε = light greenish-gray
nω = deep bluish-black
nε = light greenish-gray
Comments:
Absorption: O>>E.
Chemistry of Fencooperite
Mindat Formula:
Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O
Crystallography of Fencooperite
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
Morphology:
No crystal forms observed.
Twinning:
No twinning observed.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005724 | Fencooperite | Grice J D (2001) The crystal structure of fencooperite: Unique [Fe3O13] pinwheels cross-connected by [Si8O22] islands The Canadian Mineralogist 39 1065-1071 | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.892 Å | (100) |
3.148 Å | (40) |
2.820 Å | (90) |
2.685 Å | (80) |
2.208 Å | (40) |
2.136 Å | (40) |
1.705 Å | (35) |
Comments:
Trumbull Peak, California, USA. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence 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:
Synonyms of Fencooperite
Other Language Names for Fencooperite
German:Fencooperit
Russian:Фенкуперит
Simplified Chinese:氯碳硅铁钡石
Spanish:Fencooperita
Traditional Chinese:氯碳矽鐵鋇石
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Fencooperite associated with Sanbornite | Ba2(Si4O10) |
3 photos of Fencooperite associated with Gillespite | BaFe2+Si4O10 |
Related Minerals - Strunz-mindat Grouping
9.BH. | Bunnoite | Mn2+6AlSi6O18(OH)3 |
9.BH.05 | Aminoffite | Ca2(Be,Al)(Si2O7)(H2O,OH) |
9.BH.10 | Kinoite | Ca2Cu2(H2O)2[Si3O10] |
9.BH.15 | Akatoreite | Mn2+9Al2Si8O24(OH)8 |
Fluorescence of Fencooperite
Not fluorescent.
Other Information
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 Fencooperite
mindat.org URL:
https://www.mindat.org/min-10343.html
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References for Fencooperite
Localities for Fencooperite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
USA | |
| Walstrom (n.d.) +2 other references |
| Roberts et al. (2001) +1 other reference |
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Trumbull Peak Ba-silicate deposit, Trumbull Peak, Clearing House, Clearing House Mining District, East Belt, Mariposa County, California, USA