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Chalcedony. Chalcedony ( / kælˈsɛdəni / kal-SED-ə-nee, or / ˈkælsəˌdoʊni / KAL-sə-doh-nee) [ 2] is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. [ 3] These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic.
A birthstone is a gemstone that represents a person's birth period, usually the month or zodiac sign. Birthstones are often worn as jewelry or a pendant necklace. History of birthstones
Crystal is a transparent mineral resembling glass, most probably a variety of quartz. Job places it in the same category with gold, onyx, sapphire, glass, coral, topaz, etc. The Targum renders the qrt of Ezech. as "ice"; the other versions translate it as "crystal". Crystal is again mentioned in Apoc., iv, 6; xxi, 11; xxii, 1.
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.
Luminous gemstones. Folktales about luminous gemstones are an almost worldwide motif in mythology and history among Asian, European, African, and American cultures. Some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds.
In archaeology, the term alabaster includes objects and artefacts made from two different minerals: (i) the fine-grained, massive type of gypsum, [ 1] and (ii) the fine-grained, banded type of calcite. [ 2] Chemically, gypsum is a hydrous sulfate of calcium, whereas calcite is a carbonate of calcium. [ 2] [ 3] As types of alabaster, gypsum and ...
Agate will form crystals within the reduced cavity, and the apex of each crystal may point towards the center of the cavity. The priming layer is often dark green, but can be modified by iron oxide resulting in a rust like appearance. [8] Agate is very durable, and is often found detached from its host matrix, which has eroded away.
Cameo ( / ˈkæmioʊ /) is a method of carving an object such as an engraved gem, item of jewellery or vessel. It nearly always features a raised (positive) relief image; contrast with intaglio, which has a negative image. [ 1] Originally, and still in discussing historical work, cameo only referred to works where the relief image was of a ...
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