Manganneptunite

specimen number:
2133182

location:
Yubileinaya, Karnasurt Mt., Kola Peninsula, Russia

description:
Very rich masses and crystalline manganneptunite embedded in matrix. Good example for the species.

The Yubileinaya pegmatite on the Kola Peninsula in Russia is part of the Lovozero alkaline massif, a geologically unique region known for its complex nepheline syenites and extreme enrichment in rare elements. Discovered and studied during the 20th century, the pegmatite has produced a wide variety of rare minerals formed in highly evolved alkaline environments. The geology is characterized by unusual chemical conditions rich in sodium, titanium, and rare elements, which led to the formation of minerals rarely found elsewhere. Although not a major mining operation in the traditional sense, Yubileinaya has been an important scientific and collecting locality, with material recovered through research and limited extraction.

Manganneptunite is a rare titanium silicate mineral that contains manganese and occurs in highly alkaline pegmatite environments such as those found on the Kola Peninsula. It typically forms as black to dark brown prismatic crystals with a vitreous to submetallic luster, often showing well developed crystal faces. Manganneptunite is structurally related to neptunite and is part of a group of minerals that form under unusual geochemical conditions involving high concentrations of alkali elements and titanium.

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