Sugilite (/ˈsuːɡɪlaɪt/ SOO-gi-lyt ) is a relatively rare pink to purple cyclosilicate mineral with the complex chemical formula K )2Li 30. 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 to 6.5 and a specific gravity of 2.75 to 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 syenite. It is found in a similar environment at Mont Saint-Hilaire , Quebec. In the Wessels mine in Northern Cape Province, sugilite is mined from a strata-bound deposit. It is also reported from Liguria; New South Wales and Madhya Pradesh
Note: The mineral is commonly pronounced with a soft "g", as in "ginger". However, as with most minerals, its pronunciation is intended to be the same as the person it is named after; in this case, the Japanese name Sugi has a hard "g", as in "geese".
The mineral is also referred to as lavulite, luvulite, and royal azel by gem and mineral collectors.