Colour: Colourless, pale pink, brownish, red-brown
Sidorenkite is a rare mineral in syenite pegmatites (Webmin).
At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, sidorenkite occurs in sodalite syenite xenoliths associated with an intrusive alkalic gabbro-syenite complex. Associated minerals include rasvumite, ussingite and villiaumite (HOM).
At the type locality, the Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, sidorenkite is a rare low-temperature hydrothermal mineral, it occurs as a very late forming mineral in irregular grains and in crystals to 2 cm, in pegmatites cutting cancrinite syenite. It is associated with K-feldspar, nepheline, sodalite and cancrinite, and is cut by aegirine (AM 64.1332, HOM).
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