sedimentary (geologically classified as a variety of chalcedony/quartz)
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mottled green, white, gray, and brown; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mottled green, white, gray, and brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mottled green, white, gray, and brown; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich volcanic flows or hydrothermal activity where silica precipitates in cavities, creating orbicular (eye-like) patterns. The primary deposits are found in the shorelines of Madagascar.
Uses & applications
Primarily used in the jewelry industry for cabochons, beads, and carvings. It is a highly popular collector's mineral and is frequently used in 'metamorphic' or 'holistic' stone therapy.
Geological facts
Ocean Jasper is technically only found on the coast of Madagascar. Many veins can only be reached by boat and mined during low tide, which is how it earned its name. It is known for its distinct 'orbs' or spherical inclusions.
Field identification & locations
Identify in the field by its high hardness (cannot be scratched by a steel knife), smooth waxy feel when polished, and distinctive circular or 'flower' patterning. Commonly found in coastal Madagascar and occasionally as similar rhyolitic jaspers in the American West.
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