Wadalite

wadalite

chlormayenite

katoite

kalsilite

Images

Formula: Ca₆Al₅Si₂O₁₆Cl₃
Nesosilicate (insular SiO₄ groups), wadalite group, forms a series with chlormayenite
Crystal System: Isometric
Specific gravity: 3.06 calculated
Streak: White
Colour: Lemon-yellow, colourless, grey, black
Luminescence: Not fluorescent under UV
Common impurities: Mg,Fe
Environments

Volcanic igneous environments
Metamorphic environments

Localities

At the type locality, Koriyama City, Fukushima Prefecture, Japan, wadalite occurs as tris-tetrahedral crystals up to 1 mm in size. Along margins and fractures, it is partially replaced by katoite. There are also pseudomorphs of katoite and other species after wadalite. The type material occurs in a calcsilicate xenolith in two-pyroxene andesite. Associated minerals include spinel, melilite group minerals, leucite, kalsilite, forsterite and calcite (Mindat).

At the Negra Mine, Maconi, Cadereyta de Montes Municipality, Queretaro, Mexico, wadalite occurs as granular crystals, less than 200 microns in size, associated with hydrogrossular in skarn (AM 83.909-910).

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