Скачать или смотреть Dunilite - Danu Group Rare Gemstones Collection

Ceylon Natural Dunilite Gemstone - Danu Group Rare Gemstones Collection

Dunilite is rare olivine group mineral with corresponding chemical formula Magnesium, Iron, Manganese, Silicate (Mg,Fe,Mn)2SiO4. Long mistaken for green peridot, dunilite was identified in 2000 as a new gem variety from olivine group. Dunilite- Discovered by Mr Dunil Palitha Gunasekera in 1996.

Dunilite occurs in only one locality called, “Katukubura mountain” Kolonne, Sri Lanka. Dunilite can be found in colours light greenish yellow to brownish green, the depth of colour being related to the iron content of the stone.

• Group: Olivine
• Crystal System: Orthorhombic
• Lustre: Vitreous
• Fluorescence: None
• Hardness: 6 1/2
• Fracture: Uneven
• Cleavage: None
• Specific Gravity: 3.48
• Birefringence : 0.041
• Optic Sign: Biaxial (-)
• Dispersion: 0.020
• Transparency: Transparent to translucent
• Habit: Tabular, rectangle shaped aggregate crystals

• Refractive Index: a= 1.677, B=1.700, y=1.718 ( The refractive indices of dunilite are higher than peridot and sinhalite )

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