Formula:
Na4K4Mn2+2Ti8O4(Si4O12)4(OH)4.10-12H2O
Cyclosilicate (ring silicate), labuntsovite group,
labuntsovite supergroup,
manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.8 to 3.02 measured
Hardness: 6
Streak: White to pale orange
Colour: Pale to deep orange, rose to brownish yellow, red
Solubility: Dissolves with difficulty in hydrochloric, nitric and sulphuric acids; readily soluble in HF (Dana)
Common impurities: Fe,Mn,Mg,Ca
Environments:
Pegmatites
Carbonatites
Hydrothermal environments
Labuntsovite-Mn is a hydrothermal alteration product of murmanite in alkalic pegmatites
in a differentiated alkalic massif and in carbonatite
(Webmin ).
Localities
At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, labuntsovite-Mn occurs in cavities in igneous
breccia zones and in nepheline syenite
and hornfels, occasionally as an epitactic overgrowth on
elpidite
(Dana).
There are two co-type localities, the Yum'egor Pass, Khibiny Massif, and Pegmatite number 19, Kuftnyun Mountain, Lovozersky District,
both in Murmansk Oblast, Russia. Labuntsovite-Mn is widely distributed in the Lovozero and Khibina alkalic massifs, in druses
with albite and natrolite, and associated with
aegirine, nepheline,
microcline, eudialyte,
lorenzenite and
murmanite. It is a hydrothermal
alteration product of murmanite and is sometimes altered to
anatase
(AM 41.163, Dana).
At the Kovdor Zheleznyi Mine, Kovdor Massif, Murmansk Oblast, Russia, labuntsovite-Mn occurs in carbonatites, and sometimes alters
to anatase
(Dana).
At the Diamond Jo Quarry, Magnet Cove, Hot Spring counyt, Arkansas, USA labuntsovite-Mn occurs in
syenite associated with baryte,
gypsum, aegirine and
microcline
(Dana).
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