sedimentary

Ocean Jasper

Orbicular Jasper/Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Multicolored (green, brown, pink, white); Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; SG: 2.6-2.9

Hardness: 6
Color: Multicolored (green, brown, pink, white)
Luster: Vitreous to dull

Identified May 9, 2026More sedimentary →

Explore Ocean Jasper in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs); Color: Multicolored (green, brown, pink, white); Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; SG: 2.6-2.9

Formation & geological history

Formed through the slow precipitation of silica around a nucleus in volcanic rhyolite flows. The specific variety shown is only found in the Marovato region of Madagascar.

Uses & applications

Primarily used for lapidary work, jewelry making, ornamental carvings, and by mineral collectors for its unique orbicular patterns.

Geological facts

The name is a trade term for a specific orbicular jasper from Madagascar. It was lost to the world for decades before being rediscovered at low tide on the coast in 1999.

Field identification & locations

Identify by its characteristic 'orbicular' or circular 'eye' patterns and its high polish. In the field, look for nodules within weathered rhyolite matrix, specifically in coastal Madagascar.