gemstone
Polished opal
Opal, hydrated amorphous silica (SiO₂·nH₂O)
AI-generated identification · may be incorrectTypically Mohs 5.5–6.5; this polished piece is pale white with blue-green flashes and a vitreous-to-waxy luster. Opal is amorphous, with no cleavage; its play-of-color comes from light diffraction in ordered silica spheres.
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Physical properties
Typically Mohs 5.5–6.5; this polished piece is pale white with blue-green flashes and a vitreous-to-waxy luster. Opal is amorphous, with no cleavage; its play-of-color comes from light diffraction in ordered silica spheres.
Formation & geological history
Silica-rich water deposited the opal in rock cavities or cracks, where it hardened at low temperatures. Its age varies widely; the image alone cannot establish the variety or locality.
Uses & applications
Used in jewelry and as a collectible; softer opal is often set in protective designs and kept away from heat and sudden drying.
Geological facts
The visible color flashes suggest precious opal, though the photo cannot confirm whether they are natural or identify the opal type.
Field identification & locations
Look for shifting spectral flashes as the stone moves; common sources include Australia, Ethiopia, and Mexico. The specimen’s exact origin and composition require examination.
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