It has been ages since i was on here and i don't quite know how to pick up where i left off But i still have thunder bay amethyst and can send a flat rate usps mailer, medium, for $40. May also be incorrectly used in the gem trade to describe any deeply colored amethyst. The periodic table of elementsperiodic table of the elements Interactive guide to hundreds of rocks and minerals. Half of a hollow geode lined on the inner surfaces with amethyst crystals
All of the amethyst crystals are clean and lustrous with medium purple color and are internally transparent. For example, pure quartz (sio 2), is colorless, whereas amethyst, a purple variety of quartz, has its purple color caused by traces of the element iron The amount of iron present determines the intensity of the color Certain minerals exhibit a color change when exposed to light, heat, radiation, or when atomic anominalies are present. Vitreous luster glossary term at minerals.net educational reference guide
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