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Eurojade - Le Spécialiste du Jade - The Jade Specialist

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Chemical composition: sodium aluminum silicate.

Colour: wide range of colours including white, green, yellow, red, orange, violet and black. 

R.I.: 1.64-1.67. Usually the refractometer shows only one line near 1.66. 

Hardness: 6.5-7. Very tough. 

Crystal structure: monoclonic, usually massive. 

Specific gravity: 3.25-3.36. 

Sources: major sources include Myanmar, Guatemala and Siberia.

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