mineral

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Hardness: 5.5-6 on Mohs scale; Color: Pastel pink, cream, or beige; Luster: Vitreous to waxy; Structure: Amorphous (non-crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 1.9-2.3

Hardness: 5
Color: Pastel pink, cream, or beige
Luster: Vitreous to waxy

Identified March 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: Pastel pink, cream, or beige; Luster: Vitreous to waxy; Structure: Amorphous (non-crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 1.9-2.3

Formation & geological history

Formed from silica-rich water precipitating in rock cavities or veins at low temperatures. Common in volcanic ash deposits or sedimentary environments. Most pink specimens originate from post-Cretaceous volcanic regions.

Uses & applications

Primarily used in jewelry as cabochons, beads, and tumbled stones. Also used for ornamental carvings and as a 'healing stone' in metaphysical practices.

Geological facts

Unlike 'precious opal,' pink opal lacks the 'play of color' (iridescence) and is known as 'common opal.' Its pink hue is often attributed to organic compounds called quinones or tiny inclusions of palygorskite and sepiolite.

Field identification & locations

Identify in the field by its waxy luster, lack of crystal faces, and lightweight feel compared to quartz. Common locations include the Andes Mountains in Peru (highly prized) and parts of Oregon and Idaho, USA.

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