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VIII - Cyclosilicates
Crystal habit of Beryl Beryl

Name   Beryl
Chemistry   Al2Be3[Si6O18]
Hardness   7.5 - 8
Lustre   adamantine
Colour   dull white, yellow, yellow green, blue green, emerald green, blue
Streak   white 
Density [g/cm3]   2.6 - 3.8
Crystal habit   hexagonal, crystals mostly columnar, rarely tabular
Cleavage, Fracture   fracture conchoidal to uneven
other characteristics and occurrences   emerald    = green
aquamarine = blue
heliodor   = greenish yellow
morganite  = pink
in pegmatites

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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