Jasper

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https://term.museum-digital.de/md-de/tag/28610
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Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes. The specific gravity of jasper is typically 2.5 to 2.9. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper.
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  • Violettroter Jaspis-Quarzit

    Violettroter Jaspis-Quarzit

    Der violettrote Quarzit hat...

    Object information
    Image: Museum der Westlausitz Kamenz - CC BY-NC-SA

  • Fakvarc (szalagjáspis?)

    Fakvarc (szalagjáspis?)

    Mai neve: fakvarc, Lelőhely:...

    Object information
    Image: Viski Károly Múzeum Kalocsa - RR-F

  • Jaspis

    Jaspis

    Mai neve: jáspis, Lelőhely:...

    Object information
    Image: Viski Károly Múzeum Kalocsa - RR-F

  • Jaspis

    Jaspis

    Mai neve: jáspis, Lelőhely:...

    Object information
    Image: Viski Károly Múzeum Kalocsa - RR-F

  • Jaspis

    Jaspis

    Mai neve: jáspis, Lelőhely:...

    Object information
    Image: Viski Károly Múzeum Kalocsa - RR-F

References

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