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  2. 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 ...

  3. Pylos Combat Agate - Wikipedia

    en.wikipedia.org/wiki/Pylos_Combat_Agate

    The Pylos Combat Agate is a Minoan sealstone of the Mycenaean era, likely manufactured in Late Minoan Crete. It depicts two warriors engaged in hand-to-hand combat, with a third warrior lying on the ground. [1] [2] It was discovered in the Griffin Warrior Tomb near the Palace of Nestor in Pylos and is dated to about 1450 BCE. [3]

  4. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    Agate is a variety of chalcedony characterized by either transparency or color patterns, such as multi-colored curved or angular banding. Opaque varieties are sometimes referred to as jasper . [ 4 ] Fire agate shows iridescent phenomena on a brown background; iris agate shows exceptional iridescence when light (especially pinpointed light) is ...

  5. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    Chrysoprase, Greek chrysoprasos, the tenth foundation stone of the celestial Jerusalem (Apoc., xxi, 20). This is perhaps the agate of Ex., xxviii, 20, and xxxix, 13, since the chrysoprasus was not very well known among the ancients. It is a type of green agate, composed mostly of silica and a small percentage of nickel.

  6. Chrysoprase - Wikipedia

    en.wikipedia.org/wiki/Chrysoprase

    Other members of the cryptocrystalline silica family include agate, carnelian, and onyx. Unlike many non-transparent silica minerals, it is the color of chrysoprase, rather than any pattern of markings, that makes it desirable. The word chrysoprase comes from the Greek χρυσός chrysos meaning 'gold' and πράσινον prasinon, meaning ...

  7. Cameo (carving) - Wikipedia

    en.wikipedia.org/wiki/Cameo_(carving)

    A modern hand-carved portrait cameo of white on blue-layered agate, set in 18 kt white gold. Many modern cameos are carved into layered agates. The layers are dyed to create strong color contrasts. The most usual colors used for two-layer stones are white on black, white on blue, and white on red-brown. Three-layer stones are sometimes made.

  8. Heliotrope (mineral) - Wikipedia

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

    A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).

  9. Moonstone (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Moonstone_(gemstone)

    The name moonstone derives from the stone's characteristic visual effect, called adularescence (or schiller), which produces a milky, bluish interior light. This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone.

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