SILICA TERRA or Pure Flint
In nature we find Silica in sand. Quartz, Rock Crystal, Amethyst, Agate, Flint, Jasper, and Opal are all silicon oxides. Of course sand is also the basis for glass production, clay and other products. Silicon makes up 25.7% of the earth’s crust by weight and is the second most abundant element on earth.
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