Fencooperite Mineral Data

Fencooperite Mineral Data

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General Fencooperite Information

Chemical Formula:

Ba6Fe+++3Si8O23(CO3)2Cl3·H2O

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

Empirical Formula:

Ba_5.9Fe³⁺_2.9Si_8.1O_23.2Al_0.5(CO₃)₂Cl_1.6O_1.4·0.97(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

Fencooperite Image

Images:

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

Fencooperite Crystallography

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 PyramidalH-M Symbol (3m) Space Group: P 3m1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

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

Physical Properties of Fencooperite

Color:

Jet black, Dirty gray brown.

Diaphaniety:

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

Optical Properties of Fencooperite

Gladstone-Dale:

CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1691,KC= 0.1875

Optical Data:

Uniaxial (-), e=1.711, w=1.723, bire=0.0120.

Calculated Properties of Fencooperite

Electron Density:

r_electron=3.86 gm/cc
note: r_Fencooperite=4.24 gm/cc.

Fermion Index

Fermion Index = 0.08826
Boson Index = 0.91174

Photoelectric:

PE_Fencooperite= 201.84 barns/electron
U=PE_Fencooperite x r_electron= 778.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fencooperite is Not Radioactive

Fencooperite Classification

Dana Class:

64.1.2.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.1)with mixed ring types

(64.1.2)Dana Group

64.1.2.1 Fencooperite ! Ba6Fe3Si8O23(CO3)2Cl3·H2O P 3m1 3m

Strunz Class:

VIII/C.37-10 VIII - Silicates

VIII/C - Sorosilicates, other group-silicates

VIII/C.37 - Fencooperite series

VIII/C.37-10 Fencooperite Ba6Fe3Si8O23(CO3)2Cl3·H2O P 3m1 3m

Other Fencooperite Information

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Fencooperite Specimen Label here :

Fencooperite

Ba6Fe+++3Si8O23(CO3)2Cl3·H2O
Dana No: 64.1.2.1 Strunz No: VIII/C.37-10
Locality:

Notes: