Little Gems

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Opal.

 



 
Oregon Opal Luminescent yellow opal.

 

Mexican Cherry Opal Luminous red to orange opal.

 

Opal. - Cutting Information, all colours.*  

Colour:
Colourless, yellow, orange, red
Moh’s Hardness: 5-6.5
Refractive Index: 1.44-1.46
Critical Angle: 43.98°
Specific Gravity: 1.9-2.23
Fracture:
Conchoidal, brittle, splinters with ease.
Cleavage: None
Dispersion: None
Heat Sensitivity: Moderate to high (err on the side of high sensitivity). 
Birefringence (double refraction): None
Crystal Structure: Amorphous
Important ordering information: Please note that all prices are listed in Australian dollars and includes 10% GST; for international orders you will receive a 10% discount of the item(s). I will email you a final invoice including postage and insurance which will include a PayPal link for ease of payment. If you wish to pay by check or money order please contact me to make arrangements.
 

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