The group is an isomorphous mixture of the meionite and marialite endmembers.
2.
"' Meionite "'is a tectosilicate belonging to the scapolite group with the formula Ca 4 Al 6 Si 6 O 24 CO 3.
3.
Crystals are usually white or greyish-white and opaque, though meionite is found as colorless glassy crystals in the ejected limestone blocks of Monte Somma, Vesuvius.
4.
The two endmembers are meionite ( Ca 4 Al 6 Si 6 O 24 CO 3 ) and marialite ( Na 4 Al 3 Si 9 O 24 Cl ).
5.
Minerals associated with humite include grossular, wollastonite, forsterite, monticellite, cuspidine, fluoborite, ludwigite, dolomite, calcite, talc, biotite, spinel, vesuvianite, sanidine, meionite and nepheline.
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