Limousinite
Limousinite is an IMA-recognized mineral species in the phosphate class, with the chemical formula BaCa[Be₄P₄O₁₆]·6H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 2.58; Vitreous luster; optically biaxial.
IMA symbol Lms, IMA status: approved, named in 2019.
Found in vugs in altered primary nodular Li-Fe-Mn phosphates (triplite, alluaudite, and heterosite) in beryl-bearing granitic pegmatite.
It is found associated with Greifensteinite, black amorphous vitreous Mn-oxyhydroxide, triplite, quartz.
The name refers to the French historical region Limousin from which studied material was collected. The name Limousin is derived from Lemovices, a native first millenary BC Gaulish tribe.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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