) is a rare pink to purple cyclosilicate
mineral with the complex chemical formula KNa2
. 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.