https://cunnan.lochac.sca.org/api.php?action=feedcontributions&feedformat=atom&user=58.107.61.130Cunnan - User contributions [en]2026-05-13T09:32:27ZUser contributionsMediaWiki 1.39.3https://cunnan.lochac.sca.org/index.php?title=Quartz&diff=30409Quartz2006-11-16T07:38:13Z<p>58.107.61.130: </p>
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<div>'''Quartz''' is a crystalline form of ''silica'' (SiO<sub>2</sub>) and is one of the most common gemstones in the world. The name itself comes from the Old English word for "right-angle stone". However, some authorities believe it derives from the Slavic word for "hard". The ancient Europeans believed quartz to be a petrified form of water; hence the name ''crystalus'', from the Greek word for "ice".<br />
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Quartz comprises an entire family of gemstones, which are classified according to color:<br />
*rock crystal (clear quartz)<br />
*smoky quartz (also known as ''morion'' & ''caingorm''; formerly sold under the trade name "smoky topaz")<br />
*amethyst (purple quartz; also ''amethyst quartz'', which is purple with translucent bands of white quartz)<br />
*citrine (golden yellow to scarlet red quartz; when occuring in the same stone as amethyst, it is known as ''ametrine'')<br />
*rose quartz (translucent quartz that is pale to rose pink in color)<br />
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There are also man-made varieties of quartz, such as ''prasiolite'', which is pale green, and ''blue crystal'', a vivid cobalt blue in color.</div>58.107.61.130