Topaz is a rare silicate mineral with a chemical composition of Al2SiO4(F,OH)2. It usually forms in fractures and cavities of igneous rocks such as pegmatite and rhyolite, late in their cooling history. It is also found as water-worn pebbles in stream sediments derived from those igneous rocks.
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Showing posts with label what is topaz. Show all posts
Showing posts with label what is topaz. Show all posts
Thursday, October 6, 2016
Precious Topaz The Silicate Mineral
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