glass

Opalite

Synthetic Opalised Glass

Hardness: 5.5-6 (Mohs scale); Color: Milky white to translucent blue with orange-lilac glow (opalescence); Luster: Vitreous; Crystal Structure: Amorphous; Fracture: Conchoidal; Specific Gravity: 2.1-2.5

Hardness: 5
Luster: Vitreous

Identified July 8, 2026More glass →

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Physical properties

Formation & geological history

Human-made through a process of melting silica together with various metal oxides (such as dolomite) to create a glowing effect that mimics natural opal or moonstone. It does not occur naturally in the earth.

Uses & applications

Used primarily in decorative jewelry, beads, tumbling for pocket stones, and holistic/spiritual crystal practices.

Geological facts

While it is man-made, it is sold in rock shops worldwide. It is famous for its 'Tyndall effect' which causes it to appear blue against dark backgrounds and orange-yellow when light is shone through it.

Field identification & locations

Identify by its perfectly smooth surface, lack of natural inclusions, and the distinct blue-to-orange color shift. It is often mistaken by beginners for moonstone or white opal, but its uniform appearance and frequent air bubbles reveal its synthetic nature.