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Fencooperite Mineral Data
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General Fencooperite Information
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 Chemical Formula: |
Ba6Fe+++3Si8O23(CO3)2Cl3•H2O |
| Composition: |
Molecular Weight = 1,800.97 gm |
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Barium 44.99 % Ba 50.23 % BaO |
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Aluminum 0.75 % Al 1.42 % Al2O3 |
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Iron 8.99 % Fe 12.86 % Fe2O3 |
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Silicon 12.63 % Si 27.02 % SiO2 |
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Hydrogen 0.11 % H 0.97 % H2O |
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Carbon 1.33 % C 4.89 % CO2 |
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Chlorine 3.15 % Cl 3.15 % Cl |
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- %
Cl -0.71 % -O=Cl2 |
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Oxygen 28.05 % O |
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______ ______ |
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100.00 % 99.82 % = TOTAL OXIDE |
| Empirical Formula: |
Ba5.9Fe3+2.9Si8.1O23.2Al0.5(CO3)2Cl1.6O1.4�0.97(H2O) |
| Environment: |
Gillespite-rich zones within sanbornite-quartz lenses. |
| IMA Status: |
Approved IMA 2000 (Dana # Added) |
| Locality: |
Esquire no. 7 claim, Fresno County, California and Trumbull Peak, Mariposa County, California, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Joseph Fenimore Cooper, Jr. (1937-), mineral collector of Santa Cruz, California, USA. |
| Synonym: |
IMA2000-023 |
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Fencooperite Image |
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Images:
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Fencooperite
Comments: Micro black needles of fencooperite in white sanbornite and pinkish gillespite matrix.
Location: Trumbull Peak, Sierra Nevada, Mariposa Co., California, USA.
Scale: 2x2x2cm.
© Tom Loomis / Dakota Matrix |
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Fencooperite Crystallography
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| Axial Ratios: |
a:c = 1:0.66048 |
| Cell Dimensions: |
a = 10.727, c = 7.085, Z = 1; V = 706.04 Den(Calc)= 4.24 |
| Crystal System: |
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 3m1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.892(1)(201), 2.82(0.9)(202), 2.685(0.8)(220),2.136(0.4)(222), 2.208(0.4)(401), 3.148(0.4)(211), 1.705(0.35), |
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Physical Properties of Fencooperite
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| Color: |
Jet black, Dirty gray brown. |
| Diaphaneity: |
Opaque to translucent |
| Fracture: |
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Hardness: |
4.5-5 - Near Apatite |
| Luster: |
Vitreous - Adamantine |
| Streak: |
grayish black |
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Optical Properties of Fencooperite
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| Gladstone-Dale: |
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1691,KC= 0.1875
Ncalc = 1.79 |
| Optical Data: |
Uniaxial (-), e=1.711, w=1.723, bire=0.0120. |
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Calculated Properties of Fencooperite
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| Electron Density: |
Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Fencooperite =4.24 gm/cc.
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| Fermion Index: |
Fermion Index = 0.08
Boson Index = 0.92 |
| Photoelectric: |
PEFencooperite = 201.84 barns/electron
U=PEFencooperite x rElectron Density= 778.73 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fencooperite is Not Radioactive |
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Fencooperite Classification
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| Dana Class: |
64.01.02.01 (64)Cyclosilicates |
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(64.01)Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types |
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(64.01.02)Dana Group |
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64.01.02.01 Fencooperite! Ba6Fe3Si8O23(CO3)2Cl3•H2O P 3m1 3m |
| Strunz Class: |
09.BH.20 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BH -Sorosilicates with Si3O10, Si4O11, etc |
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09.BH.20 Fencooperite! Ba6Fe3Si8O23(CO3)2Cl3•H2O P 3m1 3m |
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Other Fencooperite Information
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| References: |
NAME( AmMin, Vol 87, p 765) PHYS. PROP.(AmMin, Vol 87, p 765) OPTIC PROP.(AmMin, Vol 87, p 765) |
| See Also: |
Links to other databases for Fencooperite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Fencooperite
Ba6Fe+++3Si8O23(CO3)2Cl3•H2O
Dana No: 64.01.02.01 Strunz No: 09.BH.20
Locality:
Notes:
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