Coralloite
Coralloite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Mn²⁺Mn³⁺₂(AsO₄)₂(OH)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P1). It is a member of the Arthurite structural group.
Key properties: specific gravity 3.26; Vitreous luster.
IMA symbol Crll, IMA status: approved, named in 2010.
Found as a secondary mineral in strataform manganese deposits.
It is found associated with Calcite, inesite, quartz, brandtite, sarkinite, tilasite.
The mineral was named to honor Giorgio Corallo (b. 1937), a mineral collector, who found several new minerals (cassagnaite, gravegliaite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more C minerals or help write this entry.