mineral
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
AI-generated identification · may be incorrectHardness: 5.5 to 6 on Mohs scale; Color: Pastel pink, cream, with occasional white or brown swirls; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Cleavage: None; Specific gravity: 1.9 to 2.3
- Hardness
- 5
- Color
- Pastel pink, cream, with occasional white or brown swirls
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 5.5 to 6 on Mohs scale; Color: Pastel pink, cream, with occasional white or brown swirls; Luster: Vitreous to waxy; Crystal structure: Amorphous (non-crystalline); Cleavage: None; Specific gravity: 1.9 to 2.3
Formation & geological history
Formed at low temperatures from silica-rich waters that seep into crevices of igneous rocks and harden over millions of years. Much of the world's high-quality pink opal is from the Tertiary period found in the Andes Mountains.
Uses & applications
Primary use is in the jewelry industry for beads, cabochons, and carvings. It is also a popular specimen for crystal healing collectors.
Geological facts
Unlike 'Precious Opal', Pink Opal is a common opal that does not exhibit play-of-color (iridescence). Its distinctive pink hue is often attributed to organic compounds called quinones or tiny inclusions of palygorskite and sepiolite.
Field identification & locations
Identify by its waxy luster and lack of shine compared to quartz. Common locations include Peru (Andes), Australia, and the USA. Collectors should look for even color saturation and the absence of large fractures.
