Images
Formula: (Na,Ca)4(Mn2+,Fe2+)2(Zr,Ti,Nb)2(Si2O7)2(O,F)4
Sorosilicate (Si2O7 groups), wöhlerite group,
manganese-, zirconium-,
titanium- and
niobium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.4 to 3.55 measured, 3.498 calculated
Hardness: 6
Streak: Yellowish white
Colour: Colourless to brownish yellow, brown, brownish red, orange-brown
Solubility: Slowly attacked by hydrochloric acid
Environments
Plutonic igneous environments
Pegmatites
Låvenite occurs in alkalic rocks and related pegmatites.
Associated minerals include feldspars,
nepheline, titanite,
ilmenite, apatite,
zircon, amphibole,
biotite, eudialyte,
catapleiite, astrophyllite,
rinkite, lorenzenite and
aegirine
(HOM).
Localities
At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, låvenite
occurs in a biotite-rich xenolith and in the contact of
eudialyte-rich altered
pegmatites
(Dana).
Låvenite from the Poudrette Quarry -
Image
On the Mount Hvide Ryg north slope, Werner Bjerge Complex, Sermersooq, Greenland, Denmark, låvenite
has been found in a loose block of nepheline syenite associated
with kochite
(Minrec 35.4.354).
At the In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany, låvenite occurs
as orange, long-prismatic crystals with a few yellow, tabular wöhlerite
crystals as epitaxial intergrowths
(Mindat photo).
Låvenite from the In den Dellen quarries -
Image
The type locality is Låven, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway.
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