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Difference between revisions of "Beryl"
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[[File:Emerald Sample.jpg|400px|thumb|Emerald, a variety of beryl]] | [[File:Emerald Sample.jpg|400px|thumb|Emerald, a variety of beryl]] | ||
'''Beryl''' is a mineral composed of beryllium aluminium silicate. Well-known varieties of beryl include [[emerald]] and aquamarine. Naturally occurring hexagonal | '''Beryl''' is a mineral composed of beryllium aluminium silicate. Well-known varieties of beryl include [[emerald]] and aquamarine. Naturally occurring hexagonal [[crystal]]s of beryl can be up to several meters in size, but terminated crystals are relatively rare. | ||
Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, pink, and red (the rarest). | Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, pink, and red (the rarest). | ||
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==History of use== | ==History of use== | ||
When the first eyeglasses were constructed in 13th-century Italy, the lenses were made of beryl (or of rock crystal) as glass could not be made clear enough. Consequently, glasses were named ''brille'' in German. | When the first eyeglasses were constructed in 13th-century Italy, the lenses were made of beryl (or of rock [[crystal]]) as glass could not be made clear enough. Consequently, glasses were named ''brille'' in German. | ||
==Spiritual uses== | ==Spiritual uses== | ||