mineral

Pink opal

Common opal, hydrated amorphous silica (SiO₂·nH₂O), commonly colored by trace organic or iron compounds

AI-generated identification · may be incorrect

Typically opaque pink with a waxy to vitreous luster, conchoidal fracture, no cleavage, and hardness about 5.5–6.5 Mohs; specific gravity is approximately 1.9–2.2. This rounded specimen appears tumbled or naturally water-worn, with fractures and earthy inclusions.

Identified August 30, 2026More mineral →

Explore Pink 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 low-temperature silica deposited in volcanic cavities, fractures, or sedimentary environments, often replacing material in hydrothermal systems. It is geologically young compared with many crystalline rocks; exact age cannot be determined from the image.

Uses & applications

Used as a lapidary stone for cabochons, carvings, beads, and polished specimens; its softness limits durable jewelry use. Common pieces have modest collector value.

Geological facts

Pink opal lacks the regular crystal lattice of quartz and is therefore mineraloid rather than a true crystalline mineral. It generally does not show precious opal’s play-of-color.

Field identification & locations

Identify it by its opaque pink body color, low hardness, waxy luster, and absence of cleavage; avoid prolonged soaking, heat, and harsh chemicals because opal can contain water. Important sources include Peru, Australia, Mexico, and the United States.