mineral
Pink Opal
Hydrated silica (SiO2 "n H2O)
AI-generated identification · may be incorrectHardness: 5.5-6 on Mohs scale; Color: Pale pink to rose; Luster: Vitreous to waxy; Crystal structure: Amorphous; Cleavage: None (conchoidal fracture); Specific gravity: 1.9-2.3
- Hardness
- 5
- Color
- Pale pink to rose
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 5.5-6 on Mohs scale; Color: Pale pink to rose; Luster: Vitreous to waxy; Crystal structure: Amorphous; Cleavage: None (conchoidal fracture); Specific gravity: 1.9-2.3
Formation & geological history
Formed at low temperatures from silica-rich groundwater filling cavities in volcanic or sedimentary rocks. It is most notably associated with secondary mineralization in Tertiary and Quaternary volcanic deposits.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads) and as a decorative stone in lapidary arts.
Geological facts
Unlike precious opal, pink opal is a 'common opal' that does not show a play-of-color. Its pink hue is often caused by micro-inclusions of palygorskite or organic compounds.
Field identification & locations
Identify in the field by its waxy luster, lack of fire/play-of-color, pink color, and relative lightness compared to quartz. Common locations include Peru, Australia, and Mexico.
