Ocean Jasper

Trade name for a Jasper with spherical inclusions.

Ocean Jasper Shop

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Origin of Name: named "Ocean" Jasper by an American mineral dealer because the first known deposit was located very close to the sea.

Synonyms and trade names: mineralogically correkt: orbicular jasper, translucent or semi-translucent specimens should correctly be termed ocean chalcedony or orbicular chalzedony

Localities: the most important sources are located on Madagascars west coast, near the villages of Moravato and Kambaby. Apparently the Moravato deposit is already depleted (Spring 2015).


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Ocean Jasper from Madagascar

Other deposits producing Jasper with similar inclusions are in the USA (Arizona, California and South Dakota) and in Russia (southern Ural Mountains and wetsren Siberia).

Handling: like all Quartzes Ocean Jasper is sensitive to hydrofluoric acid only.

Ocean Jasper Shop

Gemmological Properties of Ocean Jasper

Formula:
SiO2
Crystal system:
trigonal
Mohs hardness:
6.5-7
Specific gravity:
2.58-2.91
Refractive index:
birefringent 1.543-1.554
Max. Birefringence:
0.009
Dispersion:
0.013
Pleochroism:
none
Luminiscence:
inert
Lustre:
vitreous
Cleavage:
weak
Fracture:
conchoidal