mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Hardness: 6.5-7 (Mohs). Color: Multicolored (greens, whites, creams, ochre). Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.6 – 2.9.

Hardness: 6
Color: Multicolored (greens, whites, creams, ochre)
Luster: Vitreous to waxy

Identified July 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed by hydrothermal activity where silica-rich fluids permeate volcanic rocks (Rhyolite), cooling to form chalcedony and quartz macro-crystals. It originates from the Marovato region of Madagascar, specifically along the coastline.

Uses & applications

Primarily used in jewelry, as decorative lapidary slabs, for tumbling, and as a popular specimen for metaphysical collectors.

Geological facts

This specific variety is only found at the edge of the ocean in Madagascar and was originally discovered in the 1950s but lost for 45 years until rediscovered in 1999. It can only be mined during low tide.

Field identification & locations

Identified by its distinctive 'orbicular' (circular or eye-shaped) patterns and mottled green and white coloration. Field identification relies on its high hardness and lack of cleavage. It is highly sought after by lapidary artists for its unique patterns.

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