mineral

Tumbled pink opal (likely common opal)

Opal, hydrated amorphous silica (SiO₂·nH₂O)

AI-generated identification · may be incorrect

Usually pale pink to peach with cloudy translucence and dark matrix inclusions; vitreous to waxy luster, no cleavage, conchoidal fracture, and Mohs hardness about 5.5–6.5. The rounded shape indicates mechanical tumbling and polishing.

Identified August 23, 2026More mineral →

Explore Tumbled pink opal (likely common opal) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms as silica-rich groundwater deposits in cavities, fractures, and volcanic rocks; its age depends on the host deposit, commonly Cenozoic. The specimen may also be pink chalcedony or dyed quartz, which cannot be confirmed from the image alone.

Uses & applications

Used as an inexpensive cabochon, bead, ornamental stone, and lapidary material; generally unsuitable for heavy construction.

Geological facts

Common pink opal lacks the multicolored play-of-color typical of precious opal. It may contain iron or manganese impurities and can be porous, so avoid prolonged soaking, heat, and harsh chemicals.

Field identification & locations

Identify by its low-to-moderate hardness, waxy appearance, cloudy pink body, and absence of visible quartz crystal faces; common sources include Peru, Australia, Mexico, and the western United States. A hardness, specific-gravity, or spectroscopy test would help distinguish it from pink chalcedony.