Sugilite
Sugilite · Rare Collector Mineral and Semi-Precious Ornamental Gemstone
Crystal System
Hexagonal system, typically found as massive or compact crystal aggregates rather than distinct well-formed crystals
Mineral Group
Silicates, specifically the milarite group of cyclosilicates
Chemical Formula
KNa2(Fe,Mn,Al)2Li3Si12O30
Formation Process
Metasomatic replacement and hydrothermal processes within manganese-rich deposits, typically under high-temperature and moderate-pressure conditions
About This Crystal
A polished tumbled stone displaying a deep royal purple to violet color with dark dendritic veining, web-like matrix inclusions, and a vitreous to waxy luster, ranging from opaque to translucent
Physical Characteristics
Rich purple body color with black or dark brown manganese oxide inclusions and matrix veins, white streak, uneven fracture, lack of distinct cleavage, specific gravity of approximately 2.74 to 2.80, brittle tenacity, and no notable strong fluorescence
Optical Properties
Uniaxial negative optical sign, refractive index ranging from roughly 1.607 to 1.610, low birefringence, and generally non-pleochroic due to the massive compact habit
Hardness & Durability
Origin Region
Wessels Mine in the Kalahari Manganese Field of South Africa, Iwagi Islet in Japan, and parts of India and Canada; forms in manganese-rich metamorphic and igneous environments
Hardness & Durability
Mohs hardness of 5.5 to 6.5, moderate toughness, stable under normal environmental conditions but sensitive to harsh acids, suitable for jewelry with proper protective settings
Care & Maintenance
Clean gently using warm, soapy water and a soft cloth, avoiding ultrasonic or steam cleaners, harsh chemicals, prolonged direct sunlight to prevent color alteration, and store separately from harder gemstones to avoid scratching
Rarity & Value
Rare to very rare, especially for top-grade gem-quality material with intense gel-like translucency and deep purple saturation, commanding high prices per carat among collectors and fine jewelry makers
Special Characteristics
Distinctive vibrant purple coloration caused by trace manganese substitution, occasionally displaying a gel-like translucency in the finest specimens known as gel sugilite
Lore & History
Discovered in 1944 by Japanese petrologist Ken-ichi Sugi, sugilite gained popularity in the late 20th century as a significant spiritual stone associated with the third eye and crown chakras, traditionally believed to promote deep emotional healing, wisdom, and spiritual awareness