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Phosphate

Footemineite

Ca₂Mn²⁺₅Be₄(PO₄)₆(OH)₄·6H₂O
Hardness4.5–5
Crystal systemTriclinic
ClassPhosphate
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Footemineite specimen

Footemineite Locality: Foote Lithium County Mine (Foote Mine), Kings Mountain District, Cleveland County, North Carolina , USA ( Locality at mindat.org ) Brown crystals of Footemineite. Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Footemineite

Footemineite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₂Mn²⁺₅Be₄(PO₄)₆(OH)₄·6H₂O.

It crystallizes in the triclinic crystal system (space group P-1).

Key properties: Mohs hardness 4.5–5; specific gravity 2.873; White streak; Vitreous to slightly pearly luster; optically biaxial.

IMA symbol Ftm, IMA status: approved, named in 2006.

On thin fractures crossing quartz-microcline-spodumene pegmatite.

It is found associated with Albite, analcime, eosphorite, siderite/rhodochrosite, fairfieldite, fluorapatite, quartz, milarite, pyrite.

The name refers to the Foote mine, source of the first samples.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more F minerals or help write this entry.