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Footemineite

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Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
© 2005 JBS

Show Footemineite Photos (11)
Formula:
Ca
 
2
Mn
2+
 
Mn
2+
2
Mn
2+
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
System:TriclinicColour:Yellow
Hardness:4½ - 5
Name:For the type locality
Dimorph of:Roscherite
Isostructural with:Atencioite


Roscherite Group

Classification of Footemineite

IMA status:Approved 2006
Strunz 8th edition ID:7/D.01-70
Nickel-Strunz 10th (pending) edition ID:8.DA.10

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

Type Locality:Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
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:
AlbiteAnalcimeEosphoriteSideriteRhodochrosite
FairfielditeApatite-(CaF)QuartzMilaritePyrite

Physical Properties of Footemineite

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

Crystallography of Footemineite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Space Group:P1
Cell Parameters:a = 6.742Å, b = 9.883Å, c = 9.981Å
α = 74.12°, β = 86.1°, γ = 87.36°
Ratio:a:b:c = 0.682 : 1 : 1.01
Unit Cell Volume: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 Diffraction:
d-spacingIntensity
9.393 (53)
5.922 (100)
4.799 (26)
3.173 (44)
2.983 (14)
2.787 (35)

Optical Data of Footemineite

Type:Biaxial (-)
RI values: nα = 1.620(2) nβ = 1.627(2) nγ = 1.634(2)
2V:Measured: 080° , Calculated: 089.6°
Maximum Birefringence:δ = 0.014

Chart 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 Footemineite

Formula:
Ca
 
2
Mn
2+
 
Mn
2+
2
Mn
2+
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
All elements listed in formula:Be, Ca, H, Mn, O, P

Relationship of Footemineite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DA.05Bearsite
Be
 
2
[OH|AsO
 
4
] · 4H
 
2
O
8.DA.05Moraesite
Be
 
2
[OH|PO
 
4
] · 4H
 
2
O
8.DA.10Roscherite
Ca(Mn
2+
 
,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Zanazziite
Ca
 
2
(Mg,Fe)(Mg,Fe,Al)
 
4
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Greifensteinite
Ca
 
2
(Fe
2+
 
, Mn)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Atencioite
Ca
 
2
Fe
2+
 
Mg
 
2
Fe
2+
2
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Ruifrancoite
Ca
 
2
[ ]
 
2
(Fe
3+
 
,Mn
2+
 
,Mg)
 
4
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
(OH,H
 
2
O)
 
2
 · 4H
 
2
O
8.DA.10Guimarãesite
Ca
 
2
(Zn,Mg,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.15Uralolite
Ca
 
2
Be
 
4
[OH|PO
 
4
]
 
3
 · 5H
 
2
O
8.DA.20Weinebeneite
CaBe
 
3
[OH|PO
 
4
]
 
2
 · 4H
 
2
O
8.DA.25Tiptopite
K
 
2
(Na,Ca)
 
2
Li
 
3
Be
 
6
[OH|(PO
 
4
)
 
3
]
 
2
 · H
 
2
O
8.DA.30Veszelyite
(Cu,Zn)
 
2
Zn(PO
 
4
)
 
2
·2H
 
2
O
8.DA.35Kipushite
(Cu,Zn)
 
5
Zn[(OH)
 
3
|PO
 
4
]
 
2
 · H
 
2
O
8.DA.35Philipsburgite
(Cu,Zn)
 
6
[(OH)
 
3
|(AsO
 
4
,PO
 
4
)]
 
2
 · H
 
2
O
8.DA.40Spencerite
Zn
 
4
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
8.DA.45Glucine
CaBe
 
4
[(OH)
 
2
|PO
 
4
]
 
2
 · 0.5H
 
2
O

Other Names for Footemineite

Synonyms:
IMA2006-029Triclinic Roscherite
Other Languages:

Other Information

Fluorescence in UV light:None
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Footemineite

Reference List:Tschermaks Mineralogische und Petrographische Mitteilungen: 22: 266-277. ("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.

Articles/Blogs about Footemineite

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    Localities for Footemineite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • 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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