mineral

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Hardness: 5.5 - 6.5 on the Mohs scale, Color: Magenta, purple, reddish-purple, brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal, Cleavage: Poor, Specific Gravity: 2.74 - 2.80

Hardness: 5

Identified July 31, 2026More mineral →

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Physical properties

Hardness: 5.5 - 6.5 on the Mohs scale, Color: Magenta, purple, reddish-purple, brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal, Cleavage: Poor, Specific Gravity: 2.74 - 2.80

Formation & geological history

Formed in manganese-rich metamorphic environments and alkaline igneous rocks like syenites and pegmatites.

Uses & applications

Used primarily as an ornamental stone, carved into beads, cabochons, and jewelry, and collected as a rare mineral specimen.

Geological facts

Sugilite was first discovered in 1944 by Japanese petrologist Ken-ichi Sugi, after whom it was named. Gem-quality sugilite is quite rare and often prized for its vibrant purple color.

Field identification & locations

Identified by its distinctive rich purple or magenta color, often mottled with darker or lighter patches and white inclusions. Commonly found in South Africa, Japan, India, and Canada.