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Formula: KNaMg2(Mg3Si12)O30
Cyclosilicate (ring silicate), osumilite group, forms a series with
eifelite
Crystal System: Hexagonal
Specific gravity: 2.6 measured, 2.63 calculated
Hardness: 5 to 6
Streak: White
Colour: Colourless, yellowish to reddish brown
Common impurities: Ti,Al,Mn
Environments
Metamorphic environments
Meteorites
Localities
At the type locality, the Indarch meteorite, Hindarx, Aghjabadi District, Azerbaijan, roedderite has been found
as an accessory in the enstatite
chondrite. The assemblage in which it occurs consists of
enstatite, clinoenstatite,
troilite,
nickel-iron and small amounts of
schreibersite, plagioclase,
tridymite, oldhamite, glass and
carbon
(AM 51.949-955).
At the Bellerberg volcano, Vordereifel, Mayen-Koblenz District, Rhineland-Palatinate, Germany, roedderite occurs in
vesicles in contact metamorphosed
gneiss xenoliths in leucite
tephrite. Associated minerals include
hematite, tridymite,
sanidine, spinel,
pyroxene, quartz and
sillimanite
(HOM).
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