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Phosphate

Fluorcarmoite-(BaNa)

Ba   Na₂Na₂   CaMg₁₃Al(PO₄)₁₁(PO₃OH)F₂
Hardness7.5
Crystal systemMonoclinic
ClassPhosphate
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Fluorcarmoite-(BaNa)

Fluorcarmoite-(BaNa) is a rare phosphate mineral, belonging to arrojadite group, with the formula Ba[]Na2Na2[]CaMg13Al(PO4)11(PO3OH)F2. It is a barium-rich member of the group, as is arrojadite-(BaNa), arrojadite-(BaFe), fluorarrojadite-(BaFe) and an unapproved species ferri-arrojadite-(BaNa). The "-(BaNa)" suffix informs about the dominance of the particular elements (here barium and sodium) at the corresponding structural sites.

Intro adapted from Wikipedia (CC BY-SA).

Fluorcarmoite-(BaNa) is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ba   Na₂Na₂   CaMg₁₃Al(PO₄)₁₁(PO₃OH)F₂.

It crystallizes in the monoclinic crystal system (space group Cc). It is a member of the Arrojadite structural group.

Key properties: Mohs hardness 7.5; specific gravity 3.4; Yellow-orange streak; Vitreous luster; optically biaxial.

IMA symbol Fcm-BaNa, IMA status: approved, named in 2015.

Found in a river pebble derived from phosphate-bearing quartzites.

It is found associated with Quartz, almandine, fluorapatite.

The name refers to Monte Carmo di Loano, the highest peak in the area where the mineral was found.

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