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  2. 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 ...

  3. 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 ...

  4. Aqeeq - Wikipedia

    en.wikipedia.org/wiki/Aqeeq

    A geode of chalcedony richly colored by hematite that gives it its rusty hues and marks it as Akik [contradictory] Aqeeq, akik or aqiq (Arabic: العقيق) means quartz in Arabic, and agate in Turkish, however in the context of rings usually refers to a ring set with a chalcedony stone. Well-known types of chalcedony are carnelian, agate, and ...

  5. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety. Mineral variety names are listed after the valid minerals for each letter.

  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. Chert - Wikipedia

    en.wikipedia.org/wiki/Chert

    Chalcedony is a microfibrous quartz. [16] Agate is distinctly banded chalcedony with successive layers differing in color or value. [66] Onyx is a banded agate with layers in parallel lines, often black and white (sardonyx). [67] Magadi-type chert is a variety that forms from a sodium silicate precursor in highly alkaline lakes such as Lake ...

  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. Cryptocrystalline - Wikipedia

    en.wikipedia.org/wiki/Cryptocrystalline

    Agate and onyx are examples of cryptocrystalline silica . The quartz crystals in chalcedony are so tiny that they cannot be distinguished with the naked eye. [ 2 ]

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