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Footemineite Mineral Data
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General Footemineite Information
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 Chemical Formula: |
Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4•6H2O |
| Composition: |
Molecular Weight = 1,122.79 gm |
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Barium 0.24 % Ba 0.27 % BaO |
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Strontium 0.23 % Sr 0.28 % SrO |
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Lithium 0.11 % Li 0.23 % Li2O |
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Calcium 6.75 % Ca 9.44 % CaO |
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Magnesium 0.11 % Mg 0.18 % MgO |
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Manganese 20.31 % Mn 26.22 % MnO |
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Beryllium 3.45 % Be 9.58 % BeO |
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Aluminum 0.07 % Al 0.14 % Al2O3 |
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Iron 2.59 % Fe 2.75 % FeO / 0.64 % Fe2O3 |
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Silicon 0.20 % Si 0.43 % SiO2 |
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Phosphorus 16.03 % P 36.73 % P2O5 |
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Hydrogen 1.47 % H 13.12 % H2O |
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Oxygen 48.45 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca1.89Sr0.03Ba0.02Mn2+0.9Li0.17Mg0.05Mn2+3.25Fe2+0.43Fe3+0.09Al0.03Be4.3P5.81
Si0.08O24(OH)3.64(H2O)0.36�6(H2O) |
| Environment: |
Late fracture-filling mineral in a quartz-microcline-spodumene pegmatite. Dimorphous with roscherite. Isostructural with atencioite. |
| IMA Status: |
Approved IMA 2006 (Dana # Added) |
| Locality: |
Foote Mine, Kings Mountain District, Cleveland Co.unty, North Carolina, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Synonym: |
IMA2006-029 |
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Roscherite (C-1) |
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Roscherite-1A |
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Triclinic-roscherite |
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Footemineite Image |
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Images:
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Footemineite
Comments: Yellow, barrel-shaped, prismatic footemineite crystal (AmMin v93:2.
Location: Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, U.S.A.
Scale: Crystal size 0.8 mm.
© American Mineralogist |
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Footemineite Crystallography
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| Axial Ratios: |
a:b:c =0.6807:1:1.0042 |
| Cell Dimensions: |
a = 6.788, b = 9.972, c = 10.014, Z = 2; alpha = 73.84°, beta = 85.34°, gamma = 87.44° V = 648.26 Den(Calc)= 5.75 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 5.998(1)(011), 9.575(0.53)(010), 3.192(0.44)(210),2.803(0.38)(103), 2.65(0.29)(202), 4.848(0.26)(021), 2.424(0.14)(231), 3.003(0.14)(022), |
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Physical Properties of Footemineite
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| Cleavage: |
{011} Good, {100} Good |
| Color: |
Yellow. |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite). |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
4.5 - Between Fluorite and Apatite |
| Luster: |
Vitreous - Pearly |
| Streak: |
white |
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Optical Properties of Footemineite
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| Gladstone-Dale: |
CI calc= 0.496 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.109,KC= 0.2165
Ncalc = 2.24 |
| Optical Data: |
Biaxial (+), a=1.62, b=1.627, g=1.634, bire=0.0140, 2V(Calc)=88, 2V(Meas)=80. Dispersion r < v or r>v, weak. |
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Calculated Properties of Footemineite
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| Electron Density: |
Bulk Density (Electron Density)=5.66 gm/cc
note: Specific Gravity of Footemineite =5.75 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEFootemineite = 8.80 barns/electron
U=PEFootemineite x rElectron Density= 49.80 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Footemineite is Not Radioactive |
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Footemineite Classification
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| Dana Class: |
42.07.07.07 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.07)where (AB)5 (XO4)3 Zq � x(H2O) |
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(42.07.07)Roscherite group |
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42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 |
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42.07.07.03 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 |
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42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 |
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42.07.07.08 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
| Strunz Class: |
08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DA -With small (and occasionally larger) cations |
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08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 |
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08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 |
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08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 |
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08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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Other Footemineite Information
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| References: |
NAME( AmMin, v93:1) PHYS. PROP.(AmMin, v93:1) OPTIC PROP.(AmMin, v93:1) |
| See Also: |
Links to other databases for Footemineite :
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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Print or Cut-and-Paste your Footemineite Specimen Label here :
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Footemineite
Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.07 Strunz No: 08.DA.10
Locality:
Notes:
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