Sugilite

Sugilite is a relatively rare pink to purple cyclosilicate mineral. The crystals 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 found in an aegirine syenite intrusive stock.

The mineral also referred to as lavulite, luvulite, and royal azel by gem and mineral collectors. In Japan, it found as yellowish-white to colourless, and is not good for jewellery.