Cerchiaraite-(Mn)
Cerchiaraite-(Mn) is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₄Mn³⁺₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄].
It crystallizes in the tetragonal crystal system (space group I4/mmm). It is a member of the Cerchiaraite structural group.
Key properties: Mohs hardness 4.5; specific gravity 3.62; Pale green streak; Vitreous luster; optically uniaxial.
IMA symbol Ccr-Mn, IMA status: approved, named in 1999.
Developed in small fractures and veinlets within metacherts of an ophiolitic sequence during prehnite-pumpellyite facies metamorphism.
It is found associated with Quartz, pectolite, orientite, calcite.
The name refers to the analog of cerchiaraite with dominant manganese in the octahedral structural site.
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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