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Fencooperite Mineral Data

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General Fencooperite Information

Help on Chemical  Formula: Chemical Formula: Ba6Fe+++3Si8O23(CO3)2Cl3•H2O
Help on Composition: Composition: Molecular Weight = 1,800.97 gm
   Barium    44.99 %  Ba   50.23 % BaO
   Aluminum   0.75 %  Al    1.42 % Al2O3
   Iron       8.99 %  Fe   12.86 % Fe2O3
   Silicon   12.63 %  Si   27.02 % SiO2
   Hydrogen   0.11 %  H     0.97 % H2O
   Carbon     1.33 %  C     4.89 % CO2
   Chlorine   3.15 %  Cl    3.15 % Cl
               -   %   Cl   -0.71 % -O=Cl2   
   Oxygen    28.05 %  O
            ______        ______ 
            100.00 %       99.82 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba5.9Fe3+2.9Si8.1O23.2Al0.5(CO3)2Cl1.6O1.4�0.97(H2O)
Help on Environment: Environment: Gillespite-rich zones within sanbornite-quartz lenses.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Esquire no. 7 claim, Fresno County, California and Trumbull Peak, Mariposa County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Joseph Fenimore Cooper, Jr. (1937-), mineral collector of Santa Cruz, California, USA.
Help on Synonym: Synonym: IMA2000-023

Fencooperite Image

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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

Fencooperite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.66048
Help on Cell Dimensions: Cell Dimensions: a = 10.727, c = 7.085, Z = 1; V = 706.04 Den(Calc)= 4.24
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 3m1
Help on X Ray Diffraction: 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),

Physical Properties of Fencooperite

Help on Color: Color: Jet black, Dirty gray brown.
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: grayish black

Optical Properties of Fencooperite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1691,KC= 0.1875
Ncalc = 1.79
Help on Optical Data: Optical Data: Uniaxial (-), e=1.711, w=1.723, bire=0.0120.

Calculated Properties of Fencooperite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Fencooperite =4.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEFencooperite = 201.84 barns/electron
U=PEFencooperite x rElectron Density= 778.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fencooperite is Not Radioactive

Fencooperite Classification

Help on  Dana Class: Dana Class: (64)Cyclosilicates
  (64.01)Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types
  (64.01.02)Dana Group Fencooperite! Ba6Fe3Si8O23(CO3)2Cl3•H2O P 3m1 3m
Help on  Strunz Class: Strunz Class: 09.BH.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BH -Sorosilicates with Si3O10, Si4O11, etc
09.BH.20 Fencooperite! Ba6Fe3Si8O23(CO3)2Cl3•H2O P 3m1 3m

Other Fencooperite Information

Help on References: References: NAME( AmMin, Vol 87, p 765) PHYS. PROP.(AmMin, Vol 87, p 765) OPTIC PROP.(AmMin, Vol 87, p 765)
Help on See Also: 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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Dana No: Strunz No: 09.BH.20





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