Mineral
Ocean Jasper
Orbicular Quartz (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: multicolored including brown, yellow, pink, green, white, Luster: Vitreous to dull, Crystal structure: Microcrystalline, Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: multicolored including brown, yellow, pink, green, white, Luster: Vitreous to dull, Crystal structure: Microcrystalline, Cleavage: None
Formation & geological history
Formed in highly silicified rhyolite or tuff. It is found exclusively along the northwestern coast of Madagascar.
Uses & applications
Primarily used for ornamental purposes, lapidary arts, jewelry (cabochons, beads, pendants), and collecting.
Geological facts
Ocean Jasper is technically a spherulitic chalcedony. The primary deposit can only be seen and mined at low tide.
Field identification & locations
Identified by its distinctive spherical (orbicular) patterns and diverse color combinations. Found only in Madagascar.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
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Epidote
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Nephrite Jade
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral