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Beryl
:''"Beril" and "Heliodor" redirect here. For the character in Tolkien's legendarium, see House of Bëor. For the given names, see Beryl (given name) or Heliodorus (given name). For the Sailor Moon villain, see Queen Beryl. For other uses, see Beryl (disambiguation).''
In geology, beryl is a mineral composed of beryllium aluminium cyclosilicate with the chemical formula Be3Al2Si6O18. 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.
==Etymology==
The name beryl is derived (via Latin: ''beryllus'', Old French: ''beryl'', and Middle English: beril) from Greek βήρυλλος ''beryllos'' which referred to a "precious blue-green color-of-sea-water stone"; akin to Prakrit ''verulia'', ''veluriya'' ("beryl"). The German word ''Brille'' and the Dutch word ''bril'' (eyeglasses) are also derived from Prakrit ''verulia''.〔Olivelle, Patrick (2006), Between the Empires, Society in India 300 BCE to 400 CE, page 463, Oxford University Press.〕 The term was later adopted for the mineral beryl more exclusively.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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