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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 ...
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.
Blue chalcedony intaglio of a woman (Greek) Namibian "blue lace agate", a common trade name for Namibian blue chalcedony. Blue Chalcedony - Hebrew יָשְׁפֶה yošp̄e, Greek ἴασπις iaspis, Latin jaspis; the twelfth stone of the breastplate (Exodus 28:18, 39:11), representing the tribe of Benjamin. In the Greek and Latin texts ...
Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...
Turritella agate; This page was last edited on 30 May 2016, at 11:25 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4. ...
Parmesan vs. Parmigiano Reggiano. During my time in Italy, whenever I slipped and said “Parmesan” or “Parm” instead of the cheese’s official name, Parmigiano Reggiano (a mouthful!), I ...
Lake Superior Agate - Duluth, Minnesota. The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior.Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan.
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