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A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
An amethyst geode that formed when large crystals grew in open spaces inside the rock. The largest amethyst geode found as of 2007 was the Empress of Uruguay, found in Artigas, Uruguay in 2007. It stands at a height of 3.27 meters, lies open along its length, and weighs 2.5 tons. Amethyst is also found and mined in South Korea. [19]
Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.
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The article mentions what is supposedly the "largest amethyst geode in the world". I have seen sources report the sale of geodes more than 10x the weight. I havent made an edit before or read any community guidelines, so i figured id drop a note and someone else can fix it. ChipmunkMooshroom 02:00, 24 December 2023 (UTC)
The Aztecs' own masks are more typically of turquoise inlay, the Mayans' of jade inlay (see gallery). Another supposed type of Pre-Columbian hardstone carving is the rock crystal skull ; however experts are now satisfied that all known large (life-size) examples are 19th-century forgeries, though some miniature ones may be genuinely Pre-Columbian.
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