Calciojohillerite
Calciojohillerite is an IMA-recognized mineral species in the arsenate class, with the chemical formula NaCaMgMg₂(AsO₄)₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Alluaudite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.915; White streak; Vitreous luster; optically biaxial.
IMA symbol Cjhl, IMA status: approved, named in 2016.
Forms as a sublimate at an active volcanic fumarole.
It is found associated with Hematite, tenorite, johillerite, nickenichite, bradaczekite, hatertite, magnesiohatertite, badalovite, aphthitalite-group sulfates, langbeinite.
The prefix, calcio, identifies the calcium analogue of johillerite.
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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