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Formula:
Ca6Zr2Na6ZrTi(Si2O7)4(OF)2F4
Sorosilicate (Si2O7 groups), rinkite group of
the seidozerite supergroup,
zirconium- and
titanium- bearing mineral
Crystal System: Triclinic
Specific gravity: 3.30 measured, 3.27 calculated
Hardness: 5 to 6
Streak: White
Colour: Tannish brown to medium brown, greyish brown
Common impurities: Ce,Fe,Mn
Environments
Plutonic igneous environments
Pegmatites
Rosenbuschite occurs in some nepheline syenites and
related pegmatites
(Webmin, HOM).
Localities
At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada, rosenbuschite occurs in
miarolytic cavities in nepheline syenite
(Dana).
At Cuma, Phlegrean Fields Volcanic Complex, Naples, Campania, Italy, the
marmolite trachytic
phonolitic lava domes are among the oldest Phlegrean
products cropping out. The Cuma rocks have an agpaite groundmass, with
early K-feldspar, iron-rich
clinopyroxene, ferro-edenite
and sodalite and late rosenbuschite,
fluorite, baddeleyite,
pyrochlore, britholite,
monazite, aegirine (often
zirconium-rich) and exceptionally iron–
and manganese- rich olivine
(Geological Magazine 149.3.532–550).
At the type locality, Skutesundskjær, Barkevik area, Langesundsfjorden, Larvik, Vestfold, Norway, rosenbuschite
occurs in a fluorite-bearing
nepheline syenite pegmatite (Dana, Mindat). Associated
minerals include biotite, aegirine,
natrolite, sodalite,
nepheline, molybdenite,
zircon, tritomite,
lavenite, rinkite,
eudialyte and leucophanite
(HOM, Mindat).
At Gränna, Jönköping, Jönköping County, Sweden, rosenbuschite occurs with
eudialyte, fluorite and
arfvedsonite
(Dana).
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