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Footemineite

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About FootemineiteHide

Formula:
Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O
Colour:
Yellow
Lustre:
Vitreous, Pearly
Hardness:
4½ - 5
Specific Gravity:
02.873 (Calculated)
Crystal System:
Triclinic
Name:
Named for the type locality, Foote Mine, North Carolina, USA.
Dimorph of:
Isostructural with:

Classification of FootemineiteHide

Approved
Approval Year:
2006
8.DA.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations

Pronounciation of FootemineiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of FootemineiteHide

Vitreous, Pearly
Transparency:
Transparent
Colour:
Yellow
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Comment:
By analogy with other roscherite-group minerals.
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {011} and {100}
Density:
02.873 g/cm3 (Calculated)

Optical Data of FootemineiteHide

Type:
Biaxial (-)
RI values:
nα = 1.620(2) nβ = 1.627(2) nγ = 1.634(2)
2V:
Measured: 080° , Calculated: 089.6°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak r > v or r < v
Pleochroism:
Visible
Comments:
β (brownish yellow) > α = γ (yellow).

Chemical Properties of FootemineiteHide

Formula:
Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O
IMA Formula:
Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O

Crystallography of FootemineiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 6.742 Å, b = 9.883 Å, c = 9.981 Å
α = 74.12°, β = 86.1°, γ = 87.36°
Ratio:
a:b:c = 0.682 : 1 : 1.01
Unit Cell V:
637.92 ų (Calculated from Unit Cell)
Morphology:
Prismatic to bladed generally rough to barrel-shaped crystals
Twinning:
Twinning is simple, by reflection, with twin boundaries across the length of the crystals.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.393 (53)
5.922 (100)
4.799 (26)
3.173 (44)
2.983 (14)
2.787 (35)
2.413 (14)

Type Occurrence of FootemineiteHide

General Appearance of Type Material:
Prismatic to bladed generally rough to barrel-shaped crystals up to about 1.5 mm long and 1 mm in diameter
Place of Conservation of Type Material:
Museu de Geociências, Instituto de Geociências, Universidade
de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil
Geological Setting of Type Material:
Quartz-microcline-spodumene pegmatite
Associated Minerals at Type Locality:

Synonyms of FootemineiteHide

Relationship of Footemineite to other SpeciesHide

Other Members of this group:
AtencioiteCa2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2OMon.
GuimarãesiteCa2Be4Zn5(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
OkruschiteCa2Mn2+5Be4(AsO4)6(OH)4·6H2OMon. 2/m : B2/b
RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
RuifrancoiteCa2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2OMon. 2/m : B2/b
ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b

Related Minerals - Nickel-Strunz GroupingHide

8.DA.05BearsiteBe2(AsO4)(OH) · 4H2OMon.
8.DA.05MoraesiteBe2(PO4)(OH) · 4H2OMon.
8.DA.10RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
8.DA.10ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
8.DA.10GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2OMon.
8.DA.10AtencioiteCa2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
8.DA.10RuifrancoiteCa2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2OMon. 2/m : B2/b
8.DA.10GuimarãesiteCa2Be4Zn5(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
8.DA.15UraloliteCa2Be4(PO4)3(OH)3 · 5H2OMon.
8.DA.20WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon.
8.DA.25TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2OHex.
8.DA.30Veszelyite(Cu,Zn)2Zn(PO4)2 · 2H2OMon. 2/m : P21/b
8.DA.35Kipushite(Cu,Zn)5Zn(PO4)2(OH)6 · H2OMon.
8.DA.35Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2OMon.
8.DA.40SpenceriteZn4(PO4)2(OH)2 · 3H2OMon. 2/m : P2/b
8.DA.45GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
8.DA.50Ianbruceite[Zn2(OH)(H2O)(AsO4)](H2O)2Mon. 2/m : P21/b

Fluorescence of FootemineiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FootemineiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fanfani, L., Nunzi, A., Zananni, P.F., Zanzari, A.R. (1975) The crystal structure of roscherite. Tschermaks Mineralogische und Petrographische Mitteilungen: 22: 266-277. (as "triclinic roscherite")
Rastsvetaeva, R.K., Chukanov, N.V., Verin, I.A., Atencio, D. (2007) The crystal structure of footemineite. Transactions (Doklady) of the Russian Academy of Sciences/Earth Science Section: 416: 1053-1056.
Atencio, D., Matioli, P.A., Smith, J.B., Chukanov, N.V., Coutinho, J.M.V., Rastsvetaeva, R.K., Möckel, S. (2008) 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. American Mineralogist: 93: 1-6.
Poirier, G., Ercit, T.S., Tait, K.T., Piilonen, P.C., Rowe, R. (2009) New mineral names. American Mineralogist: 94: 399-408.

Internet Links for FootemineiteHide

Localities for FootemineiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Minas Gerais
    • Itinga
      • Taquaral
Leavens, P., White, J., and Nelen, J., 1990, Zanazzi from Minas Gerais, Brazil, Mineralogical Record 21, 413-417.
USA (TL)
 
  • North Carolina
    • Cleveland Co.
      • Kings Mountain District
Atencio, D., Matioli, P.A., Smith, J.B., Chukanov, N.V., Coutinho, J.M.V., Rastsvetaeva, R.K., Möckel, S. (2008): 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. American Mineralogist, 93, 1-6.
Mineral and/or Locality  
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