Jasmundite

minerals

srebrodolskite

brownmillerite

larnite

Formula: Ca11O2(SiO4)4S
Nesosilicate (insular SiO4 groups)
Specific gravity: 3.03
Hardness: 5
Streak: White
Colour: Pale to smoky green, also greenish brown
Solubility: Soluble in dilute hydrochloric acid
Common impurities: Al,Fe,Mg
Environments

Metamorphic environments

Jasmundite occurs in metamorphosed limestone inclusions in basalt (Webmin).

Localities

At the type locality, Ettringer Feld, Southern lava flow, Bellerberg volcano, Ettringen, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany, jasmundite occurs in metamorphosed limestone xenoliths in basalt (Mindat, HOM, Dana) as irregular grains, up to several millimeters in size, intergrown with mayenite, brownmillerite and larnite, or associated with portlandite and ettringite (AM 69.566). Other recorded associates include calcite, vaterite, tobermorite and thaumasite (HOM, Dana).

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