Mesolite
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Mesolite is a tectosilicate mineral with formula Na2Ca2(Al2Si3O10)3·8H2O. It is a member of the zeolite group and is closely related to natrolite which it also resembles in appearance. Like other zeolites, mesolite occurs as void fillings in amygdaloidal basalt.
Mesolite crystallizes in the monoclinic system and typically forms fibrous, acicular prismatic crystals or masses. Radiating sprays of needle like crystals are not uncommon. It is vitreous in luster and clear to white in color. It has a Mohs hardness of 5 to 5.5 and a low specific gravity of 2.2 to 2.4. The refractive indices are nα=1.505 nβ=1.505 nγ=1.506.
It was first described in 1816 for an occurrence in the Cyclopean Islands near Catania, Sicily.
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