Cts. 1.20 Natural Ethiopian Opal Cabochon - Height: 10 mm - Width: 8 mm- 0.24 g

Natural Ethiopian Cab Opal
Clarity: from translucent to opaque.


Pictures taken with a high-resolution camera on different backgrounds in order to depict the opals as realistically as possible.

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An opal is a hydrated form of silica with a water content ranging from 3 to 21%. Furthermore, it is this permeability to water that makes it a hydrophile.
Opals are deposited at relatively low temperatures and can occur in the fissures of almost any type of rock, most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals display a variable interplay of internal colors.

At microscopic scales, precious opal is composed of silica spheres approximately 150 to 300 nm in diameter arranged in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing interference and diffraction of light passing through the microstructure of the opal.