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Footemineite

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Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
© 2006 JBS

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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:
SideriteRhodochrositeQuartzPyriteMilarite
FairfielditeEosphoriteApatite-(CaF)AnalcimeAlbite

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

Member of Group:
Roscherite Group:
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
 
2
(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:
IMA2006-029Roscherite-1ATriclinic 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.

Internet Links for Footemineite

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    Localities for Footemineite

    Hide Locality List
    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.
    (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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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Nov 2009 09:11:00