Sugilite
Sugilite · Rare and valuable semi-precious gemstone / ornamental stone.
Crystal System
Hexagonal system, typically massive or compact in habit; well-formed crystals are extremely rare and microscopic.
Mineral Group
Silicates, specifically the milarite-group of cyclosilicates.
Chemical Formula
KNa2(Fe,Mn,Al)2Li3Si12O30
Formation Process
Forms primarily in manganese-rich metamorphic environments and through metasomatism in intrusive igneous bodies like syenites.
About This Crystal
The specimen is shaped as a polished round bead with a central drill hole, exhibiting a distinct mottled or webbed pattern of rich purple to violet patches mixed with lighter lavender and dark matrix inclusions, displaying a waxy to vitreous luster and opaque transparency.
Physical Characteristics
Color ranges from pinkish-purple to deep royal purple with black or brownish patches; streak is pale reddish-purple; cleavage is none distinct; fracture is uneven to conchoidal; specific gravity is approximately 2.74 to 2.80; tenacity is brittle.
Optical Properties
Biaxial (-) with refractive indices around 1.607 - 1.610; birefringence is low (approx. 0.003); typically non-pleochroic or weakly pleochroic in shades of purple; displays no notable special optical phenomena like chatoyancy.
Hardness & Durability
Origin Region
Notable sources include the Wessels Mine in the Kalahari Manganese Field of South Africa, as well as Japan and India.
Hardness & Durability
Mohs hardness of 5.5 to 6.5, making it moderately durable and suitable for rings with protective settings, pendants, and bead jewelry, though it can be scratched by quartz.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemical cleaners, ultrasonic cleaners, and prolonged exposure to direct sunlight to prevent color alteration.
Rarity & Value
Considered a rare collector gemstone, particularly high-grade gem-quality royal purple material (Gel Sugilite) which commands high prices per carat; lower-grade mottled material like beads is more accessible.
Special Characteristics
Noted for its intense, natural royal purple color caused by manganese content, highly prized by collectors for its striking color contrast and unique matrix patterns.
Lore & History
Discovered in 1944 by Japanese petrologist Ken-ichi Sugi, sugilite is associated in modern metaphysical lore with spiritual love, wisdom, and emotional healing, often linked to the third eye and crown chakras.