Ussingite

specimen number:
2133349

location:
Shkatulka, Alluaiv Mt., Kola Peninsula, Russia

description:
Rich purple mass of ussingite.

The Shkatulka pegmatite, situated within the Umbozero mine workings at Mount Alluaiv in the Lovozero Massif of the Kola Peninsula, Russia, was an extraordinary underground mineralogical discovery encountered during industrial extraction. Geologically, it is an ultra-agpaitic peralkaline pegmatite body that formed during the late-stage magmatic differentiation of the multi-phase Lovozero nepheline syenite intrusion. The highly volatile and sodium-rich hyper-alkaline fluids created an extreme chemical environment that allowed for the crystallization of a massive, mineralogically unique core zone dominated by rare silicates and carbonates. Discovered in 1990 during the driving of an underground mine gallery by the state-run Lovozero Mining Company, the localized pegmatite pocket was intensively documented and sampled by geologists throughout the 1990s as a byproduct of the primary industrial mining for rare metals like niobium, tantalum, and zirconium.

Ussingite is a rare sodium aluminum silicate mineral that occurs as a primary constituent within the core of the Shkatulka pegmatite body. Geologically, it forms under highly specific hyper-alkaline, low-temperature hydrothermal conditions where late-stage residual fluids become severely enriched in sodium and depleted in calcium. The mineral belongs to the triclinic crystal system and is typically found at this locality in massive, fine-grained aggregates or dense cleavable blocks displaying a distinctive pale pink, violet, or deep lilac coloration. In the Shkatulka body, ussingite serves as the essential matrix rock for a vast suite of subsequent, highly complex ultra-agpaitic minerals, making specimens from this underground exposure critical for studying extreme alkali-magma evolutio

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