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16.50.02: Blue Peruvian Opal

Last updated

May 6, 2022
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- 16.50.01: Black Opal
- 16.50.03: Boulder Opal

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Opal
Chemical composition	SiO₂+.H₂O
Crystal system	Amorphous
Hardness	5- 6 1/2
Refractive index	1.45 (+.020;-0.080)
Specific gravity	2.15 (+0.07;-0.90)
Lustre	Vitreous
Phenomenon	Play of Color

The name comes from the source from where it is mined, the Peruvian Andes.
Other tradenames include Andean opal, Andean blue opal, Andean blue silica, and blue opal.

Diagnostics

Color

Aquamarine to sea-green color due to trace amounts of copper.

Occurrence

Main source: San Patricio, Peru.

Care

Opal is relatively soft, Peruvian opal should be treated with care as it can be scratched by any harder material. Wash in warm soapy (non-detergent) water.

Diagnostics

Color

Occurrence

Care

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