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  2. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    The Breastplate supposedly included jasper, chrysoprase and sardonyx, and there is some debate as to whether other agates were also used. In the 19th century, Idar-Oberstein, Germany, became the world's largest chalcedony processing center, working mostly on agates. Most of these agates were from Latin America, in particular Brazil.

  3. Jasper - Wikipedia

    en.wikipedia.org/wiki/Jasper

    Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.

  4. Chrysoprase - Wikipedia

    en.wikipedia.org/wiki/Chrysoprase

    Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Its color is normally apple-green, but varies from turquoise-like cyan to deep green. The darker varieties of chrysoprase are also referred to as prase.

  5. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue. This semiprecious stone should not be confused with other ornamental stones that contain red jasper. Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite.

  6. Clovis point - Wikipedia

    en.wikipedia.org/wiki/Clovis_point

    There are slight differences in points found in the Eastern United States ... with a majority between 75 and 110 mm (3.0 and 4.3 in). ... jasper, chalcedony and other ...

  7. Talk:Jasper - Wikipedia

    en.wikipedia.org/wiki/Talk:Jasper

    Jasper is a form of iron-rich chert and as such it is microgranular, composed of microscopic silica sediments. It is opaque, only translucent in very thin sections, and is, in fact, a rock. There are numerous texts that detail the differences between quartz, chalcedony, chert, and jasper, none of which seem to be sited here.

  8. Carnelian - Wikipedia

    en.wikipedia.org/wiki/Carnelian

    Similar to carnelian is sard, which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably. Both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide. The color can vary greatly, ranging from pale orange to an intense almost-black ...

  9. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...

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