Paratobermorite
Paratobermorite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₄(Al₀.₅Si₀.₅)₂Si₄O₁₆(OH)(H₂O)₂·(Ca·3H₂O).
It crystallizes in the monoclinic crystal system. It is a member of the Tobermorite structural group.
Key properties: Mohs hardness 3.5; specific gravity 2.51; White streak; Vitreous luster; optically biaxial.
IMA status: approved, named in 2021.
Found in a chrysotile asbestos deposit in grossular rhodingite.
It is found associated with Prehnite, pectolite, thomsonite-Ca, calcite.
The prefix from the Greek παρα for “near” alludes to the relationship to tobermorite.
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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