Emerald crystal in quartz

Emerald crystal in quartz

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Emerald crystal in quartz. Emerald is a variety of beryl, a beryllium aluminium cyclosilicate. Whereas beryl may vary in colour, emeralds always occur in hues of green, thanks to trace amounts of chromium in the composition. When pure and flawless, emerald is the most precious green gemstone known, the deeper the green the more desirable. The rough emerald seen here is embedded inside a quartz host rock, measuring 25 mm in length. Found in a mine in Muzo, Colombia.

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Keywords: beryl, beryllium aluminium cyclosilicate, chemical, chemistry, close-up, colombian, crystal, crystalline, crystallised, crystals, detail, earth science, embedded, gemstone, geographical, geography, geological, geology, green, host rock, mine, mineral, mineralogy, muzo, nature, precious, quartz, rock, rough, sample, silicate, south american, specimen, still life, still-life, un-cut, uncut

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