Ocean Jasper
Silicon dioxide (SiO2), orbicular chalcedony/jasper
A multicolored orbicular chalcedony from Madagascar famous for its circular eye-like orbs in greens, pinks, whites, and yellows.
- Mohs hardness
- 6.5-7
- Color
- Green, white, pink, yellow, grey with colorful orbs
- Type
- sedimentary
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Overview
Ocean Jasper is a trade name for a distinctive orbicular variety of chalcedony/jasper found along the coast of Madagascar. It is celebrated for its colorful spherical patterns, concentric "orbs" or eyes in greens, pinks, whites, reds, and yellows scattered across the stone.
Strictly speaking, much ocean jasper is a mix of jasper and chalcedony (sometimes with druzy quartz pockets), formed in silica-rich volcanic settings. The orbs are spherulites, radial growths of silica that nucleated around centers.
The original mine, accessible only at low tide, is largely depleted, making fine ocean jasper increasingly collectible. It is widely cut into cabochons, spheres, and carvings.
Formation & geology
Ocean Jasper formed in silica-rich volcanic rock (rhyolite) where chalcedony and jasper were deposited in cavities and altered zones. The characteristic orbs are spherulites: as silica crystallized, fibers grew radially outward from nucleation points, building up concentric, ringed spheres preserved in the surrounding matrix.
Variations in iron and other mineral impurities during deposition produced the wide palette of colors. Some specimens contain small quartz-lined druzy vugs. The principal deposit lies on the remote northwestern coast of Madagascar near Marovato, with the seaside primary location now mostly worked out.
How to identify it
The hallmark is round, eye-like orbs (spherulites) in multiple colors set in a chalcedony/jasper matrix, often with a glossy polish and occasional sparkly druzy quartz pockets.
It has hardness 6.5-7, waxy to glassy luster, conchoidal fracture, and a white streak. The orbs are genuinely three-dimensional growth structures, not printed or dyed; natural color zoning and varied orb sizes are tells of authenticity.
Look-alikes include other orbicular jaspers (such as poppy jasper or leopard skin jasper), which have different color schemes and orb styles, and dyed imitations with unnaturally uniform, vivid color. The pastel multicolor palette plus druzy pockets is characteristic of true Madagascar ocean jasper.
Uses & significance
Ocean Jasper is used primarily as a lapidary and ornamental stone: cabochons, beads, spheres, hearts, freeforms, and carvings, where the colorful orbs are the main attraction. It polishes beautifully and is tough enough for jewelry.
Because the original mine is largely depleted, quality ocean jasper, especially pieces with vivid, well-defined orbs and druzy accents, has become increasingly sought after by collectors, raising its value above ordinary jasper.
In the metaphysical market it is promoted as a calming, uplifting "stone of joy" linked to emotional renewal, though these claims are not scientific. Its appeal is chiefly visual and collectible.
Frequently asked questions
Where does ocean jasper come from?
Almost exclusively from the northwestern coast of Madagascar, where the original seaside deposit is now largely depleted.
What are the circles in ocean jasper?
They are spherulites, concentric spheres formed when silica crystallized radially around nucleation points during the stone's formation.
Is ocean jasper actually jasper?
It is a mix of jasper and chalcedony, sometimes with druzy quartz pockets, so the trade name is not strictly accurate but is widely accepted.
Why is ocean jasper becoming more valuable?
The original Madagascar mine is largely exhausted, so well-patterned, colorful specimens are increasingly scarce and collectible.
Can ocean jasper go in water?
Yes, its quartz-based hardness of 6.5-7 makes it water-resistant, though prolonged soaking and harsh chemicals are best avoided.
Ocean Jasper guides
In-depth guides for identifying, valuing, and understanding Ocean Jasper.
Ocean Jasper identified by the community
Real specimens identified with Rock Identifier.
