Latiumite

latiumite

kaliophilite

leucite

hauyne

Images

Formula: (Ca,K)₄(Si,Al)₅O₁₁(SO₄,CO₃ )
Phyllosilicate (sheet silicate), latiumite group
Crystal System: Monoclinic
Specific gravity: 2.93 measured, 2.92 calculated
Hardness: 5½ to 6
Streak: White
Colour: White
Solubility: Soluble in weak acids, leaving a silica residue
Common impurities: Mn,Na,Cl,H₂O,C
Environments

Volcanic igneous environments

Latiumite occurs in blocks of metamorphosed limestone ejected by volcanism. (Webmin).

Localities

At the type locality, I Cappuccini, Albano Laziale, Metropolitan City of Rome Capital, Lazio, Italy, latiumite occurs as white to glassy material, massive and in elongated tabular crystals in two ejected blocks of metamorphosed limestone, associated with hedenbergite, grossular - andradite, melilite, leucite, haüyne, and in one specimen also with kaliophilite (AM 39.402-408, HOM).

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