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  2. Chrome chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chrome_chalcedony

    Chrome chalcedony is a green variety of the mineral chalcedony, colored by small quantities of chromium. [4] Its name is derived from Mutorashanga, a small ferrochrome mining town in Zimbabwe where the mineral was discovered in the 1950s. [5] It is most commonly found in Zimbabwe, where it is known as Mtorolite, [6] Mtorodite, [7] or Matorolite ...

  3. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.

  4. Category:Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Category:Chalcedony

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  5. 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.

  6. Pietersite - Wikipedia

    en.wikipedia.org/wiki/Pietersite

    Pietersite is a commercial term for a variety of the mineral chalcedony. Originating from Namibia and China, where it is mined for use as a decorative stone due to its chaotic chatoyancy and brecciated structure. Ranging in colour from brownish-red, to blue-grey, and chatoyant yellow.

  7. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Chalcedony is a cryptocrystalline form of silica consisting of fine intergrowths of both quartz, and its monoclinic polymorph moganite. [34] Other opaque gemstone varieties of quartz, or mixed rocks including quartz, often including contrasting bands or patterns of color, are agate , carnelian or sard, onyx , heliotrope , and jasper .

  8. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...

  9. Moss agate - Wikipedia

    en.wikipedia.org/wiki/Moss_agate

    Moss agate pebble, 1 inch (25 mm) long Montana moss agate. Moss agate is a semi-precious gemstone formed from silicon dioxide.It is a form of chalcedony which includes minerals of a green color embedded in the stone, forming filaments and other patterns suggestive of moss. [1]

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