mineral

Orca Agate

Chalcedony (SiO2) with various inclusions

Hardness: 6.5-7 on Mohs scale; Color: Grey, blue-grey, white, and brown; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Grey, blue-grey, white, and brown
Luster: Waxy to vitreous

Identified April 29, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Grey, blue-grey, white, and brown; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & geological history

Formed through the deposition of silica from groundwater in cavities within igneous rocks. Primarily associated with volcanic environments where mineral-rich water cools and solidifies over thousands of years.

Uses & applications

Predominantly used for ornamental purposes, lapidary arts, decorative home decor (towers/points), and within the metaphysical/spiritual community.

Geological facts

This specific variety is named 'Orca Agate' due to its colors and patterns mimicking the skin of an Orca whale. It is unique to regions in Madagascar.

Field identification & locations

Identify by its distinct swirling grey and white 'eye' patterns and waxy texture. In the field, look for volcanic host rocks. It is popular among collectors for its calming aesthetic and unique banding.

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Mineral/Rock

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