Mineral

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Hardness: 5.5 to 6.0 on Mohs scale; Color: Baby pink to bubblegum pink; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Cleavage: None; Specific Gravity: 2.15

Hardness: 5
Color: Baby pink to bubblegum pink
Luster: Vitreous to waxy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6.0 on Mohs scale; Color: Baby pink to bubblegum pink; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Cleavage: None; Specific Gravity: 2.15

Formation & geological history

Formed at low temperatures from silica-rich groundwater that seeps into cavities or fractures in sedimentary or volcanic rock. Unlike 'precious opal', pink opal does not contain the internal structures that cause a play-of-color, though it can display chatoyancy or iridescence from mineral inclusions.

Uses & applications

Primarily used in jewelry for cabochons and beads, as well as in 'healing stone' and metaphysical markets. It is a popular ornamental stone due to its soft color.

Geological facts

Pink opal is often called 'Andean Opal' because the most significant deposits are found in the Andes Mountains. It is the national stone of Peru and is considered by some cultures to be a stone of peace and liberation from stress.

Field identification & locations

Identify in the field by its waxy luster, lack of fire (unlike precious opal), and pink hue often accompanied by black or white dendritic inclusions. Common locations include the Ica region of Peru and parts of Western Australia.