mineraloid

Pink Opal

Hydrated Silicon Dioxide (SiO2 · nH2O)

Hardness: 5.5-6.0 on Mohs scale; Color: Pastel pink with milky white banding; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Fracture: Conchoidal; Specific Gravity: 1.9-2.3

Hardness: 5
Color: Pastel pink with milky white banding
Luster: Vitreous to waxy

Identified July 6, 2026More mineraloid →

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Physical properties

Hardness: 5.5-6.0 on Mohs scale; Color: Pastel pink with milky white banding; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Fracture: Conchoidal; Specific Gravity: 1.9-2.3

Formation & geological history

Formed from the precipitation of silica-rich water at low temperatures, typically in volcanic ash layers or sedimentary basins. This common opal lacks the 'fire' of precious opal and often contains organic compounds or manganese that provide the pink hue.

Uses & applications

Primarily used in jewelry for cabochons and beads, as well as for decorative carvings, palm stones, and metaphysical purposes.

Geological facts

Unlike precious opal, pink opal is a 'common' opal, meaning it does not display a play-of-color. The most famous and highest quality pink opals are sourced from the Andes Mountains in Peru.

Field identification & locations

Identify by its characteristic waxy luster, smooth conchoidal fracture (shell-like curves), and lack of crystalline structure. It is softer than quartz and will not scratch glass easily. Major locations include Peru, Australia, and the USA.