In colour it is blue or greenish-blue, sometimes opaque, varying between that and feeble translucency, though it should be said that in all forms, even those considered opaque, a thin cutting of the stone appears almost transparent, so that the usual classing of it among the opaque stones must be [...]]]> http://www.crystalandstones.com/about-precious-stones/turquoise.html/feed 0 http://www.crystalandstones.com/about-precious-stones/beryl.html http://www.crystalandstones.com/about-precious-stones/beryl.html#comments Wed, 16 Sep 2009 15:59:43 +0000 precious stones http://www.crystalandstones.com/?p=93 The beryl is a compound of silicates of beryllia and alumina, with the formula 3BeOSiO2 + Al2O3,3SiO2, or 3BeO,Al2O3,6SiO2. It differs very little indeed from the emerald, with the exception of its colour.

In the ordinary varieties this is somewhat poor, being mostly blue, or a dirty or a greenish yellow; the better kinds, [...]]]> http://www.crystalandstones.com/about-precious-stones/beryl.html/feed 0 http://www.crystalandstones.com/about-precious-stones/topaz.html http://www.crystalandstones.com/about-precious-stones/topaz.html#comments Wed, 16 Sep 2009 15:57:38 +0000 precious stones http://www.crystalandstones.com/?p=91 The name topaz is derived from the Greek topazos, which is the name of a small island situated in the Gulf of Arabia, from whence the Romans obtained a mineral which they called topazos and topazion, which mineral to-day is termed chrysolite.

The mineral topaz is found in Cornwall and in the British Isles [...]]]> http://www.crystalandstones.com/about-precious-stones/topaz.html/feed 0