sedimentary

Orca Agate

Chalcedony (Microcrystalline Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Black, grey, and white with swirling patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.60-2.65.

Hardness: 6
Color: Black, grey, and white with swirling patterns
Luster: Vitreous to waxy

Identified May 31, 2026More sedimentary →

Explore Orca Agate 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: Black, grey, and white with swirling patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.60-2.65.

Formation & geological history

Formed primarily in Madagascar within volcanic cavities or sedimentary layers. It is a form of cryptocrystalline quartz that precipitates from silica-rich groundwater over millions of years.

Uses & applications

Popular in the metaphysical community, used for decorative carvings, polished towers, and lapidary art.

Geological facts

Named after the Orca whale due to its distinctive black and white patterns that mimic the markings of the marine mammal. It is considered a relatively recent find in the gemstone market.

Field identification & locations

Identified by its characteristic opaque grey-to-black base with fluid white 'cloud' or 'spot' inclusions. Primarily found in Madagascar. Collectors should look for high contrast and minimal fractures.