Sugilite

Sugilite is a rare potassium sodium lithium iron manganese aluminum silicate - its complex chemistry reflects the unusual geological conditions required to form it. It was first discovered on Iwagi Island, Japan in 1944 by Ken-ichi Sugi (for whom it was named), but those specimens were tiny and non-gem-quality.

The gem-grade sugilite that transformed its market status was discovered in 1979 in the Wessels manganese mine in South Africa's Kalahari Desert. Here, sugilite formed in a manganese-rich stratiform deposit where the complex chemistry of lithium, potassium, and manganese converged under specific metamorphic conditions. The purple color comes primarily from manganese.

Gem-quality sugilite is genuinely rare - the Wessels Mine remains the only significant source, and production is limited. The finest material - translucent, vivid purple with no matrix - commands prices that rival many traditional precious gems.

Sugilite is identified by its deep purple to magenta color with a waxy to vitreous luster. At hardness 5.5-6.5, it's moderately durable. The color tends to be more uniform and waxy than amethyst (which is transparent and glassy) and lacks the swirling pattern of charoite.

Distinguish from charoite (swirled fibrous texture), amethyst (transparent, crystalline), lepidolite (flaky mica texture), and dyed purple howlite or magnesite (check for dye in cracks). Genuine sugilite has a distinctive 'gel' quality - the finest pieces look almost like solidified purple liquid.