Shomiokite mineral sample
Shomiokite mineral specimen

Shomiokite-(Y): Gemstones Information

Shomiokite is a rare mineral named after Japanese mineralogist Shiro Shomioka, who first described it in 1965. It belongs to the group of silicate minerals known as eudialyte group minerals and is characterized by its complex chemical composition and vibrant colors. Here, we’ll explore detailed information about shomiokite, including its properties, occurrences, uses, and significance.

Properties of Shomiokite:

Chemical Composition: Shomiokite is a complex silicate mineral, with the chemical formula typically expressed as (Na,Ca,REE,Sr)(Zr,Nb)(Si,Al)2O7(OH,O)·n(H2O). Its composition can vary significantly due to substitutions of different elements in its crystal structure.

Color: Shomiokite exhibits a range of colors, including pink, red, brown, and yellow, often with mottled or streaked patterns. The coloration is attributed to various impurities and substitutions within its composition.

Crystal Structure: Shomiokite crystallizes in the monoclinic crystal system and typically occurs as prismatic or tabular crystals, although it can also form granular or massive aggregates.

Hardness: Its hardness ranges from 4 to 5 on the Mohs scale, making it relatively soft compared to many other minerals.

Luster: Shomiokite usually displays a vitreous to greasy luster when polished, enhancing its visual appeal.

Occurrences of Shomiokite:

Shomiokite is an exceedingly rare mineral, and significant occurrences are limited. It was first discovered in the Khibiny and Lovozero massifs on the Kola Peninsula in Russia, where it occurs in alkaline pegmatites and syenites. Other reported occurrences include the Taseq Slope in Greenland and the Bokan Mountain peralkaline granite complex in Alaska, USA.

Uses of Shomiokite:

Due to its extreme rarity and limited occurrences, shomiokite has very few practical applications. However, it is highly prized by mineral collectors and enthusiasts for its vibrant colors, unique crystal forms, and association with alkaline igneous complexes. Specimens of shomiokite are sought after for display in mineral collections and museums, where they serve as examples of rare and exotic minerals.

Significance and Value:

Shomiokite holds significance primarily in the fields of mineralogy and geological research. As a member of the eudialyte group minerals, it contributes to our understanding of alkaline igneous processes and the formation of complex mineral assemblages in these geological environments. Additionally, its extreme rarity adds to its value and allure among collectors, who are often drawn to the challenge of acquiring specimens of such elusive minerals.


In conclusion, shomiokite is a rare and visually striking mineral characterized by its complex chemical composition and vibrant colors. Occurring primarily in alkaline igneous complexes such as those found in the Kola Peninsula and Greenland, shomiokite holds significance in the realms of mineralogy, geology, and mineral collecting. While it has limited practical uses, its scarcity and aesthetic appeal make it a valuable addition to mineral collections and a subject of fascination for enthusiasts of rare minerals.

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