Colorado Topaz - Photo by Mike Sandmeier.

"Beryl is a mineral composed of beryllium aluminium cyclosilicate" It is generally green, blue, yellow, red, pink, white, to colorless...

Mohs hardness: 7.5 - 8

Colorado Beryl - more pictures and information in the CP forums.

From Wikipedia - Beryl
"The hexagonal crystals of beryl may be very small or range to several meters in size. Terminated crystals are relatively rare. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, red, and white."

Check out the Mindat.org database for detailed information about Beryl.

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