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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 ...
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.
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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.
Download QR code; Print/export Download as PDF; Printable version; ... Chrome chalcedony; Chrysoprase; Dendritic agate. Moss agate; Fire agate (iridescent var.) Jasper;
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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]
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 .