Properties
| Category | Cyclosilicate |
|---|---|
| Formula | KNa2(Fe,Mn,Al)2Li3Si12O30 |
| Crystal system | Hexagonal |
| Color | Light brownish-yellow, purple, violet, reddish violet, pale pink, colorless |
| Crystal habit | Prismatic crystals, typically granular to massive |
| Cleavage | Poor on {0001} |
| Mohs scale hardness | 6–6+1⁄2 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.74 |
From the Wikipedia article
Sugilite ( SOO-gə-lyte, -jee-) is a relatively rare pink to purple cyclosilicate mineral with the complex chemical formula KNa2(Fe, Mn, Al)2Li3Si12O30. Sugilite crystallizes in the hexagonal system with prismatic crystals. The crystals are rarely found and the form is usually massive. It has a Mohs hardness of 5.5–6.5 and a specific gravity of 2.75–2.80. It is mostly translucent. Sugilite was first described in 1944 by the Japanese petrologist Ken-ichi Sugi (1901–1948) for an occurrence on Iwagi Islet, Japan, where it is found in an aegirine syenite intrusive stock. It is found in a similar environment at Mont Saint-Hilaire, Quebec, Canada. In the Wessels mine in Northern Cape Province of South Africa, sugilite is mined from a strata-bound manganese deposit. It is also reported from Liguria and Tuscany, Italy; New South Wales, Australia and Madhya Pradesh, India.
Source
Source record: crystal-compendium/sugilite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Sugilite — revision id 1283789626. Text and properties from Wikipedia, licensed CC BY-SA 4.0.