Amethyst is formed when water on the surface of the Earth interacts with silicon dioxide, or SiO2 and causes it to dissolve. After conditions change to cause the solution to evaporate or cool, the silicon dioxide will pr... More » Science Chemistry Atoms & Molecules

Amethyst is a reddish-purple color, inspired by the crystalline quartz. The quartz received its name from a Greek myth in which Dionysus wept tears of wine that stained the quartz statue of a beautiful maiden. More »

Deep Russian amethyst is a rare, high-quality grade of quartz from Russia. It's also known as deep Siberian amethyst. "Deep" refers to the stone's rich purple color. More »

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The solubility of silicon dioxide, SiO2, in water depends on a number of different factors, including pressure, temperature and the structure of its surface. Generally speaking, silicon dioxide is virtually insoluble in ... More » Science Chemistry Solutions & Mixtures

Silica is a compound that occurs in rocks and minerals in the form of silicon dioxide, SiO2. It can be found in quartz, flint and sand. It is used to make glass, ceramics and concrete. More » Science Earth Science Geology

The primary element in glass is silica, or silicon oxide (SiO2). However, on its own silica can be difficult to work with since it has an incredibly high melting point of more than 3,000 degrees Fahrenheit and is extreme... More » Science Chemistry Atoms & Molecules

The chemical formula for silicon dioxide, also called silica, is SiO2. Silicon and oxygen are two of the most abundant elements in the Earth's crust, with silica composing 59 percent. When exposed to oxygen, silicon surf... More » Science Chemistry Atoms & Molecules