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Formula: Na2Ca4Zr(Nb,Ti)(Si2O7)2(O,F)4
Sorosilicate (Si2O7 groups),
wöhlerite group,
zirconium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.40 to 3.44 measured, 3.42 calculated
Hardness: 5½ to 6
Streak: Yellowish white
Colour: Light to dark yellow, brown, grey
Common impurities: Ti,Hf,Al,Y,Ce,La,Fe,Ta,Mn,Mg,Sr
Environments
Plutonic igneous environments
Pegmatites
Carbonatites
Metamorphic environments
Wöhlerite occurs as a late phase in alkaline pegmatites, an accessory mineral in
syenite and
nepheline syenite, in
fenite associated with alkaline intrusives and in carbonatites
(HOM, Dana, Webmin, Mindat).
Associated minerals include cancrinite,
ferro-hornblende, aegirine,
astrophyllite, mosandrite-(Ce),
eudialyte, catapleiite,
rosenbuschite, lavenite,
zircon, pyrochlore,
latrappite,
niobian perovskite, niobian
zirconolite, albite,
nepheline, biotite
and fluorite
(HOM).
Localities
At the type locality, Løvøya, Langesundsfjorden, Porsgrunn, Telemark, Norway, wöhlerite occurs in a
syenite pegmatite
(Mindat).
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