克拉 6.45 天然衣索比亞蛋白石 弧面形 - 高度: 8 mm - 闊度: 6 mm- 1.29 g

Natural Ethiopian Cab Opals
Clarity: from translucent to opaque;


Pictures taken with 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%.Indeed, it is this permeability to water that makes it a hydrophile.
Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals show a variable interplay of internal colors.

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