Footemineite Mineral Data

General Footemineite Information

Chemical Formula:

Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4•6H2O

Composition:

Molecular Weight = 1,122.79 gm

Barium 0.24 % Ba 0.27 % BaO

Strontium 0.23 % Sr 0.28 % SrO

Lithium 0.11 % Li 0.23 % Li₂O

Calcium 6.75 % Ca 9.44 % CaO

Magnesium 0.11 % Mg 0.18 % MgO

Manganese 20.31 % Mn 26.22 % MnO

Beryllium 3.45 % Be 9.58 % BeO

Aluminum 0.07 % Al 0.14 % Al₂O₃

Iron 2.59 % Fe 2.75 % FeO / 0.64 % Fe₂O₃

Silicon 0.20 % Si 0.43 % SiO₂

Phosphorus 16.03 % P 36.73 % P₂O₅

Hydrogen 1.47 % H 13.12 % H₂O

Oxygen 48.45 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_1.89Sr_0.03Ba_0.02Mn²⁺_0.9Li_0.17Mg_0.05Mn²⁺_3.25Fe²⁺_0.43Fe³⁺_0.09Al_0.03Be_4.3P_5.81 Si_0.08O₂₄(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

Roscherite (C-1)

Roscherite-1A

Triclinic-roscherite

Footemineite Image

Images:

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

Footemineite Crystallography

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 - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 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),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Help on Above

Atencio D , Matioli P A , Smith J B , Chukanov N V , Coutinho J M V , Rastsvetaeva R K , Mockel S , American Mineralogist , 93 (2008) p.1-6, Footemineite, the Mn-analog of atencioite, from the Foote mine, Kings Mountain,, Cleveland County, North Carolina, U.S.A., and its relationship with other, roscherite-group minerals, Locality: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA

Physical Properties of Footemineite

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

Optical Properties of Footemineite

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.

Calculated Properties of Footemineite

Electron Density:

Bulk Density (Electron Density)=5.66 gm/cc
note: Specific Gravity of Footemineite =5.75 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Footemineite= 8.80 barns/electron
U=PE_Footemineite x rElectron Density= 49.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Footemineite is Not Radioactive

Footemineite Classification

Dana Class:

42.07.07.07 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq · x(H2O)

(42.07.07)Roscherite group

42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

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

42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

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

08.D - Phosphates, etc

08.DA -With small (and occasionally larger) cations

08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Other Footemineite Information

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 :

Footemineite

Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.07 Strunz No: 08.DA.10
Locality:

Notes: