Sugilite

Physical Properties

Hardness: 5.5-6.5 on Mohs scale; Color: typically vivid purple, violet, or magenta; Luster: vitreous to dull; Crystal structure: hexagonal/milarite-group; Cleavage: poor/indistinct; Specific Gravity: 2.74 - 2.80.

Formation & Geological History

Sugilite forms in stratiform manganese deposits via metasomatic processes. The most famous deep-purple material comes from the Wessels Mine in South Africa, formed in the Kalahari Manganese Field during the Proterozoic era.

Uses & Applications

Primarily used as a gemstone for jewelry (cabochons and beads) and as a high-value collector's mineral specimen. Also used in metaphysical and holistic practices.

Geological Facts

First discovered in 1944 on Iwagi Islet, Japan, by Ken-ichi Sugi, but the gem-quality purple material was not found until 1979 in South Africa. It is often referred to as 'Royal Azel' or 'Luvulite' in the trade.

Field Identification & Locations

Identify by its unique 'grape' purple color and associated manganese minerals like braunite (dark spots). It is significantly harder than lookalikes like charoite. Primarily found in the Kuruman district of South Africa.

Identified on: 4/20/2026

Mode: Standard