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Opal

Harlequin opal
(o'-pal)

12th c.; lat. opalus; gr. opalion; sansk. upala

Translucent mineral consisting of hydrated silica of variable color. Precious opal set in jewelry has a rich iridescence and remarkable play of changing colors
Color
White, black;, gray and others with play of colors
Family
Hydrous form of silica
Chemical composition
SiO2. n H2O
Crystal system
Amorphous
Hardness (Mohs scale)
5,5 - 6,5
Specific gravity
1,90 ±0,30
Refractive index
1,44 ±0,03
Birefringence
None
Optical character
Singly refractive
Chanthaburi

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Jaipur

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