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Amethyst crystals are actually quartz (SiO2) crystals with a purplish hue derived from impurities of iron and aluminum. The crystalline structure forms from the latticework arrangement of silicon and oxygen atoms unique to quartz. Quartz crystals like amethyst can develop from silica saturated solutions or even from molten silica solutions.

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15y ago
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13y ago

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.

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14y ago

Amethyst is a variety of the mineral quartz, and could appear in all rock types.

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12y ago

Yes.

Btw, most precious gems are found in volcanic areas as they have the pressure and temperatures to work with for formation.

So are Amethyst gems

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Q: How is amethyst formed by nature?
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