Cyclosilicate (ring silicate)
Specific gravity: 2.8 to 3.02
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:
Labuntsovite-Mn is a hydrothermal alteration product of murmanite in alkalic pegmatites
in a differentiated alkalic massif and in carbonatite
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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