mineral
Ocean Jasper or Orbicular Jasper
SiO2
Mohs hardness of 6.5 to 7. Colors can include shades of green, brown, cream, white, red, and yellow. Luster is vitreous to dull. It is a microcrystalline variety of quartz (chalcedony) featuring spherical or orbicular patterned inclusions.
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Physical properties
Mohs hardness of 6.5 to 7. Colors can include shades of green, brown, cream, white, red, and yellow. Luster is vitreous to dull. It is a microcrystalline variety of quartz (chalcedony) featuring spherical or orbicular patterned inclusions.
Formation & geological history
Formed from silica-rich fluids that precipitated within cavities of volcanic rock (rhyolite). Found primarily in Madagascar.
Uses & applications
Used primarily in lapidary arts, jewelry making, and as a collectible specimen or ornamental stone.
Geological facts
Ocean Jasper is also known as orbicular jasper. The distinctive circular or 'orb' patterns are formed by spherulites (radiating crystal aggregates).
Field identification & locations
Identified by its unique orbicular patterns and variety of colors. Found almost exclusively in Madagascar. It is a highly sought-after material for lapidary work.
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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