Characteristics of Sugilite
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Characteristics of Sugilite:
Chemical Name: Potassium, sodium lithosilicate
Formula: KNa2(Fe,Mn,Al)2Li3Si12O30
Colors: Pink, brown-yellow, purple
Structure: Hexagonal
Hardness: 5.5-6.5
Specific Gravity: 2.73-2.79
Refractive Index: 1.60-1.61
Lustre: Vitreous
Streak: White
Locations: Canada, Japan, South Africa, Italy
What is Sugilite?
Sugilite was discovered in 1944, but it was only recognized as a mineral in 1976. It is most commonly found in massive or granular form, and rarely found as crystals; when crystals do occur, they are small- less than 2cm across. Its color can be pale to deep pink, brownish-yellow, or purple, with deep hues of the latter commanding the most value. It is always cut en cabochon when used a gemstone, while pebbles are sometimes polished in rock tumblers. Sugilite is named after its co-discovered, Japanese petrologist Ken-ichi Sugi.