克拉 26.30 天然埃塞俄比亚蛋白石 弧面形- 5.26 g
编号 83304453
CT。 49.40 埃塞俄比亚蛋白石 弧面形- 9.88 g
编号 83304453
CT。 49.40 埃塞俄比亚蛋白石 弧面形- 9.88 g
Natural Ethiopian Wello opal beads.
Lenght 40 cm
Beads Size: from 3 mm to 5.5mm; approx
Clarity: from translucent to opaque;
Pictures taken with high resolution camera on different backgrounds in order to depict the opals as realistically as possible.
Worldwide shipping with registered mail and tracking number.
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.