Rosenbuschite

rosenbuschite

zirconium

eudialyte

arfvedsonite

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Formula: Ca6Zr2Na6ZrTi(Si2O7)4(OF)2F4
Sorosilicate (Si2O7 groups), 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 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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