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QUARTZ is undoubtedly the single most common mineral in the Earth's crust, ranging from perhaps 12% of continental crust to as much as 50% of oceanic crust, as indicated by the composition of spreading-ridge volcanic lavas. ... Amethyst Galleries'; Mineral Gallery; MINERALS...
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mineral.galleries.com/minerals/by-name.htm
mineral.galleries.com/minerals/by-name.htm
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Information on the mineral amethyst ... AMETHYST; Purple variety of Quartz amethyst - mineral 75.1.3.1vr ... Amethyst on Amethyst Galleries' Mineral Gallery...
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www.minerals.net/mineral/silicate/tecto/quartz/varietys...
www.minerals.net/mineral/silicate/tecto/quartz/varietys/amethyst.htm
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Description, history and occurrence of the mineral Amethyst, the most important quartz variety used in jewelry, includes its physical properties. ... Amethyst is a transparent, coarse-grained, purple variety of quartz (SiO2) and has long been a the most important quartz variety used in jewelry. The presence of manganese...
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www.desertusa.com/mag99/may/papr/amethyst.html
www.desertusa.com/mag99/may/papr/amethyst.html
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Classification of Amethyst ... Physical Properties of Amethyst ... Lapis Mineral Magazin...
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www.mindat.org/min-198.html
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Lithia Amethyst mineral data, information about Lithia Amethyst, its properties and worldwide locations. ... Search for - Lithia Amethyst - on e-Rocks Mineral Sales & Auctions...
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www.mindat.org/min-27318.html
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Amethyst mineral information page at mineralminers.com: your on-line link for factual scientific & mineralogical information about natural amethyst, with links to several different types of natural amethyst items as well information on amethyst mining locations and background info on amethyst physical properties, occurance, ...
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www.mineralminers.com/html/ameminfo.htm
www.mineralminers.com/html/ameminfo.htm
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The Gemstone & Mineral Amethyst ... Large chunks of Amethyst are carved. Amethyst is also popular among mineral collectors. The Color Of Amethyst, has become a coined phrase. Many things are said to be of an Amethyst color. Even other, more expensive purple gemstones are often compared to its color and beauty.
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www.minerals-n-more.com/Amethyst_Info.html
www.minerals-n-more.com/Amethyst_Info.html
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For natural amethyst mineral specimens see our For Sale or Sold lists ... Amethyst can occur as long prismatic crystals that have a six sided pyramid at either end or can form as druzes that are crystalline crusts that only show the pointed terminations. As a mineral specimen, ... Amethyst Galleries'; Mineral Gallery; MINERALS...
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www.galleries.com/minerals/gemstone/amethyst/amethyst.h...
www.galleries.com/minerals/gemstone/amethyst/amethyst.htm
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Britannica online encyclopedia article on amethyst (mineral), a transparent, coarse-grained variety of the silica mineral quartz that is valued as a semiprecious gem for its violet colour. It contains more iron oxide (Fe2O3) than any other variety of quartz, and experts believe that its colour arises from its iron content.
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www.britannica.com/EBchecked/topic/20466/amethyst
www.britannica.com/EBchecked/topic/20466/amethyst
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