Tectosilicate (framework silicate), feldspar group, forms a series with banalsite
Specific gravity: 2.95
Common impurities: Ba,Ca,Sr
Stronalsite occurs in basic tuff xenoliths, associated with
datolite, rosenhahnite and
At the type locality, the Tanaka Olivine Mining Company quarry, Rendai, Kochi City, Kochi Prefecture, Japan, stronalsite occurs as aggregates of crystals to 1 mm across, in association with slawsonite and pectolite in veinlets cutting rodingite in the serpentinite quarry. Associated vein minerals include prehnite, xonotlite, grossular and its variety hydrogrossular and natrolite (AM 72.226).
At Mt Ohsa, Niimi City, Okayama, Japan, stronalsite occurs in veinlets and grains in jadeitic aggregates within serpentinite (HOM, Dana).
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