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Formula: Ca11O2(SiO4)4S
Nesosilicate (insular SiO4 groups)
Crystal System: Tetragonal
Specific gravity: 3.03 measured
Hardness: 5
Streak: White
Colour: Pale to smoky green, also greenish brown
Solubility: Soluble in dilute hydrochloric acid
Common impurities: Al,Fe,Mg
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).
At Jebel Harmun, Quds Governorate, West Bank, Palestine,
dzierżanowskite was found in
larnite pebbles which are embedded in a low-temperature mineral matrix.
Associated minerals are larnite,
brownmillerite,
fluorellestadite,
ye'elimite, gehlenite,
periclase, ternesite,
nabimusaite, vorlanite,
vapnikite, fluormayenite,
fluorkyuygenite, oldhamite,
jasmundite, covellite,
chalcocite and pyrrhotite
(MM 81.5.1073–1085).
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