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J

Mineral Species · Oxides

Jasper

碧玉

SiO₂ + impurities

Jasper is the opaque cryptocrystalline form of quartz — like Chalcedony but with sufficient impurities (iron oxides, clays, organic) to render it opaque rather than translucent. Color and pattern are diagnostic of named varieties: red…

Crystal system

Trigonal (microcrystalline)

Hardness

7

Specific gravity

2.6

Jasper is the opaque cryptocrystalline form of quartz — like Chalcedony but with sufficient impurities (iron oxides, clays, organic) to render it opaque rather than translucent. Color and pattern are diagnostic of named varieties: red jasper (Fe oxides), picture jasper (banded landscape patterns), ocean jasper (Madagascar orbicular), and mookaite (Australian). Jasper has been used for ornament since the Stone Age.

Key Facts

  • Mohs hardness 7.
  • Opaque cryptocrystalline quartz with >20% non-silica inclusions.
  • Major varieties: red jasper, ocean jasper, picture jasper, mookaite.
  • Color and banding pattern is each variety’s signature.
  • Used historically for cameos, seals, and ornamental tools.

Notable Localities

Madagascar (ocean jasper), Western Australia (mookaite), Bruneau (Idaho), and Oregon (picture jasper) supply named varieties.

Found at these Localities

Available in our shop

Hand-selected Jasper specimens, vetted for authenticity.

Specimens for this mineral are coming soon. Browse all Chinese specimens in the meantime.

Related Minerals

Chemistry and crystal-system companions of Jasper.

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