mineral

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

AI-generated identification · may be incorrect

Hardness: 5.5-6.5 on the Mohs scale; Color: Purple, violet, magenta, or reddish-brown; Luster: Vitreous to dull; Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 2.74-2.80

Hardness: 5
Color: Purple, violet, magenta, or reddish-brown
Luster: Vitreous to dull

Identified March 28, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5 on the Mohs scale; Color: Purple, violet, magenta, or reddish-brown; Luster: Vitreous to dull; Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 2.74-2.80

Formation & geological history

Usually found in stratabound manganese deposits or metamorphic environments. Significant deposits were formed during the Precambrian period or through later hydrothermal alteration of alkaline igneous rocks.

Uses & applications

A rare gemstone used primarily in jewelry, ornamental carvings, and by mineral collectors. It is highly valued for its intense purple saturation.

Geological facts

First discovered in 1944 by Ken-ichi Sugi in Japan, it wasn't until the 1970s that high-quality, gem-grade purple specimens were found in South Africa's Kalahari Manganese Field, making it a relatively 'new' gem in the market.

Field identification & locations

Identify in the field by its distinct, often mottled purple-to-lilac color and lack of transparency (it is mostly opaque). Key locations include South Africa, Japan, Canada, and Australia. Collectors should look for intense 'grape' color and minimal blotching from other host rocks.