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How Are Amethyst Geodes Formed?. Not even scientists are 100 percent sure exactly how amethyst geodes form--or how any geodes form. There hasn't been much research, because geodes are just fun scientific anomalies with little, if... ... eHow Article: How Are Amethyst Geodes Formed?
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www.ehow.com/how-does_4913351_how-amethyst-geodes-forme...
www.ehow.com/how-does_4913351_how-amethyst-geodes-formed.html
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AMETHYST; Purple variety of Quartz amethyst - mineral 75.1.3.1vr ... Amethyst Quartz - Mixture of Amethyst and Milky Quartz (or clear Quartz). It is purple on top and white or clear on the bottom. It may also be banded purple and white. ... Much Citrine is artificially formed by heat-treating Amethyst.
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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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Amethyst is formed in silica-rich liquids deposited in gas cavities (geodes) in lava. It occurs in crystalline masses. When conditions permit, it forms hexagonal crystals that are usually grown from a base. These crystals are most often not...
http://answers.yahoo.com/question/index?qid=20090112121...
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Silicon dioxide (SiO2) is the chemical composition of amethyst. It is a mineral which is formed like anyother mineral under the earths crust due to heat and pressure.
http://wiki.answers.com/Q/Where_does_amethyst_form
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Re: How is amethyst formed? Date: Thu Dec 3 21:49:55 1998; Posted By: Matthew Buynoski, Senior Member Technical Staff,Advanced Micro Devices; Area of science: Earth Sciences; ID: 912096319.Es ... First, amethyst is a particular color phase of quartz, and why it is that color you will find explained in "The Physics and...
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www.madsci.org/posts/archives/dec98/912744059.Es.r.html
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Subject: How is amethyst formed? ... Date: Thu Nov 26 10:05:19 1998; Posted by Pearl Vyas; Grade level: 4-6; School: Niagara st. p.s.; City: Toronto State/Province: Ontario; Country: Canada; Area of science: Earth Sciences; ID: 912096319.Es...
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www.madsci.org/posts/archives/dec98/912744059.Es.q.html
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Colorado is known for having clusters of amethyst that have formed in cavities within sandstone. Among the amethyst found in Colorado are smoky druses found in the Rockies. Other states amethyst can also be found in include Georgia, Arizona, Rhode Island and Virginia.
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www.jewelrysupplier.com/2_amethyst/amethyst_geography.h...
www.jewelrysupplier.com/2_amethyst/amethyst_geography.htm
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In Canada, Russia & the US, Amethyst formed in pegmatites (Rose Quartz Vol. 1 - Issue 1) or in metamorphic rocks. In fact each locale where Amethyst is found, seems to produce a slightly different crystal. Because of these wide ranging differences, I’ve included a short index of locations & properties.
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www.ozarkrockexchange.com/ore_features/1999/amethyst.sh...
www.ozarkrockexchange.com/ore_features/1999/amethyst.shtml
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Amethyst is formed in silica-rich liquids deposited in gas cavities of lava that occur in crystalline masses. Such cavities occur in the earth's crust for several reasons such as gas bubbling in circular cavities or filling of veins.
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www.emporia.edu/earthsci/amber/go336/haas/
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