Stronalsite

minerals

pectolite

thomsonite

vuagnatite

Formula: Na₂SrAl₄Si₄O₁₆
Tectosilicate (framework silicate), feldspar group, forms a series with banalsite
Crystal System: Orthorhombic
Specific gravity: 2.95 measured, 2.95 calculated
Hardness: 6½
Streak: White
Colour: White
Common impurities: Ba,Ca,Sr
Environments

Metamorphic environments

Stronalsite occurs in basic tuff xenoliths, associated with pectolite, slawsonite, albite, calcite, aragonite, natrolite, thomsonite, prehnite, datolite, rosenhahnite and vuagnatite (HOM, Webmin).

Localities

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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