Aenigmatite with Astrophllite, Eudialyte

specimen number:
2133192

location:
Khibiny Massif, Kola Peninsula, Russia

description:
Rich blackaenigmatite in matrix with astrophyllite and eudialyte. Very good example for the species. The specimen comes with a previous collection data card from Jack Nieberger.

The Khibiny Massif, situated on the Kola Peninsula of Russia, represents the largest alkaline intrusive complex on Earth and is a site of extreme mineralogical diversity. Geologically, this massive ring-shaped pluton formed during the Devonian period and is composed of rare agpaitic rocks, such as nepheline syenites and rischorrites, which are exceptionally rich in alkali metals and volatiles. Within this unique chemical environment, aenigmatite (a complex sodium-iron-titanium silicate) occurs as a primary constituent, typically forming jet-black, lustrous, blade-like crystals or granular masses within pegmatitic veins. Historically, the geological importance of Khibiny was first documented by Wilhelm Ramsay in the 1890s and later extensively explored by Alexander Fersman in the 1920s. Large-scale industrial mining began in 1929 to extract vast apatite-nepheline deposits for phosphate fertilizer, and these operations remain some of the largest in the world today. While the massif is economically vital for its industrial ores, it is equally famous among scientists for hosting hundreds of rare mineral species, with aenigmatite serving as a classic example of the complex silicates found within its hyper-alkaline zones.

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