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Ocean Jasper: Reading the Orbs in Madagascar's Orbicular Jasper

By Digital Towns Crystals ยท Last reviewed October 8, 2026

Short answer: ocean jasper is the trade name for an orbicular jasper from the coast of Madagascar, an opaque, fine-grained quartz rock (SiO2, Mohs 6.5 to 7, specific gravity about 2.63 to 2.65) patterned with small, tight, concentric orbs in green, white, cream, pink and red. Its value depends on how crisp and dense the orbs are, the color mix, any druzy quartz pockets, and the quality of the polish.

What are the orbs in ocean jasper?

The circles are the whole point of the stone, so it helps to know what they are. In orbicular jasper, each orb is a center from which silica grew outward in all directions at once, building a ball of radiating fibers and then concentric shells as conditions changed. Cut through a field of these balls and every one shows as a ring or a bull's-eye. Where many centers started at once, the orbs crowd together; where only a few started, they float in a plain ground.

A familiar comparison is snowflake obsidian. Geology.com explains that as volcanic glass begins to crystallize, the process starts at various locations within the rock, and at these locations it forms radial clusters of white or gray cristobalite crystals. The orbs in jasper are the same kind of structure, a radial spherical growth that starts from many points, but preserved in chalcedony and jasper instead of in glass. In ocean jasper the shells are often banded in two or three colors, and many orbs have a translucent chalcedony or tiny druzy quartz center.

What is jasper, mineralogically?

Jasper is not a separate mineral. Minerals.net describes it as an opaque form of chalcedony, which is a microcrystalline variety of quartz, and notes that it often contains so many impurities that some regard it as a rock rather than a mineral. The same reference draws a practical line: when the material is dull and lacks interesting colors or patterns, it is not jasper but rather chert. That is a trade distinction more than a scientific one. Geology.com describes chert as a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, and notes that reddish cherts colored by iron oxides are frequently called jasper.

Because jasper is quartz at heart, its physical properties are predictable:

Property Value
Composition SiO2 with mineral impurities
Mohs hardness 6.5 to 7
Specific gravity 2.63 to 2.65
Refractive index 1.54 to 1.55
Transparency Opaque
Cleavage None (conchoidal fracture)

Those figures come from the Minerals.net jasper gemstone page. Color in fine-grained quartz comes from what was mixed in as it grew; the International Gem Society notes that cryptocrystalline quartz varieties are colored chiefly by mineral impurities in the growth environment, including oxides of iron, manganese, titanium, chromium and nickel. In ocean jasper, greens and creams dominate, with pink, red and yellow from iron.

Where does ocean jasper come from?

Minerals.net defines ocean jasper as a form of orbicular jasper found on the coast of Madagascar with small, tight, concentric ring formations. Its jasper gemstone page also lists Madagascar among the important deposits of jasper generally, alongside India, Russia, Brazil, Australia and the United States.

The trade story is more detailed than the published geology. Sellers commonly name Marovato on Madagascar's northwest coast as the source, describe outcrops that can only be worked at low tide, and divide material into "old" and "new" finds by vein. Those details circulate widely in dealer catalogs, but this guide could not confirm them against an independent geological survey or museum source, so treat them as trade lore rather than fact. What a buyer can check is the stone itself: orbicular structure, color, druzy pockets and finish.

The host rock matters for those pockets. Orbicular jaspers of this kind are generally silicified volcanic rocks. Rhyolite, a high-silica volcanic rock, often contains vugs from trapped gas that later fill with crystals, opal or glassy material. The sparkling druzy cavities in many ocean jasper pieces are a version of the same thing: small open spaces lined with tiny quartz crystals.

Is all orbicular jasper ocean jasper?

No. Orbicular jasper is the general term; Minerals.net defines it simply as jasper with rounded concentric rings throughout. Ocean jasper is one regional type. Poppy jasper from Morgan Hill, California, leopard jasper with tan rings, and kinradite with white quartz rings are others, and the jasper trade names guide sorts out which names describe a real locality. Kambaba jasper, often confused with ocean jasper in listings, is a different dark green and black stone; see the planned kambaba jasper guide.

How do you recognize real ocean jasper?

Five features identify good ocean jasper in hand:

  1. Small, tight orbs. The defining pattern is fine concentric orbs, often clustered, not large single eyes.
  2. Multicolor shells. Rings of green, white, cream, pink or yellow around one center, sometimes with a darker outline.
  3. Chalcedony and druzy. Translucent zones and small quartz-lined pockets, especially on freeforms, spheres and towers.
  4. Hardness and weight of quartz. It takes a glassy polish and feels like quartz in the hand, at a specific gravity near 2.65.
  5. Opacity. Light does not pass through except at thin chalcedony edges.

Treatments and imitations

Minerals.net notes that most jasper is natural and not treated or enhanced, although occasionally it is dyed. Dyed or resin-stabilized pieces tend to show unnaturally saturated color, color pooled in cracks, or a plastic-like sheen in pits. The more common problem is naming: any patterned green jasper may be sold as "ocean jasper", and combination titles such as "ocean jasper onyx quartz geode" stack several names onto one cut piece. Read those as descriptions of what the seller sees (orbicular jasper, banded chalcedony, druzy quartz), and judge the photos rather than the title.

What drives the price of ocean jasper?

Pattern first. Dense, crisp, evenly scattered orbs with clean color separation cost far more than a few blurred rings on a plain green ground. Then color: pink, red and deep green combinations sell above pale cream and gray. Then features: druzy pockets add value on display pieces but weaken jewelry. Finally, form and size: spheres need large flawless rough and waste the most material, so a large sphere with orbs on every face is priced well above a pyramid or cube of similar weight. The guide to crystal spheres covers how sphere pricing works.

In crystal traditions ocean jasper is associated with joy and calm; that is folklore attached to the stone, not a measurable property.

Caring for ocean jasper

At Mohs 6.5 to 7 ocean jasper is durable, but druzy pockets trap dust and their tiny crystal tips can break. Clean polished faces with a soft damp cloth and mild soap, brush druzy gently with a soft brush, and avoid ultrasonic cleaners on pieces with open pockets or resin fills.

Shopping the ocean jasper we stock

Look at listing photos for orb density and sharpness across the whole piece, not only the best face; for druzy pockets that are intact rather than crushed; for fractures crossing the orbs; and for a polish that reflects evenly. A named origin of Madagascar is expected.

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Frequently asked questions

Is ocean jasper real jasper?

Yes. It is an orbicular jasper, an opaque, fine-grained quartz rock colored by mineral impurities, with a hardness of 6.5 to 7. "Ocean jasper" is a trade name for the Madagascar material, not a separate mineral species.

Why is ocean jasper so expensive compared with other jaspers?

Fine ocean jasper with dense, crisp, multicolored orbs comes from a limited coastal source and yields few large flawless pieces. Ordinary pieces with sparse or blurry orbs are inexpensive. Price follows pattern quality, color, druzy features and size.

How can you tell ocean jasper from kambaba jasper?

Ocean jasper shows small concentric orbs in light greens, creams, pinks and whites, often with druzy pockets. Kambaba jasper is darker, with black and deep green rounded patterns and no druzy. If the orbs have colored rings, it is the orbicular Madagascar type.

Can ocean jasper get wet?

Yes, it is quartz-based and tolerates water. Dry druzy pockets well so residue does not collect, and avoid harsh chemicals or ultrasonic cleaning on pieces with fractures, resin fills or open cavities.

What makes the orbs in ocean jasper?

Each orb grew from a single center, with silica crystallizing outward as radiating fibers and then concentric shells. When the stone is cut, these spheres show as rings. The structure is similar to the radial cristobalite clusters that form snowflake obsidian.

Sources