Fengite is a transparent form of marble or alabaster. In former times it was sometimes used for windows instead of glass. Transparent glass ball In optics, transparency is the property of allowing light to pass. ... Venus de Milo, front. ... A modern uplighter lamp made completely from Italian alabaster (white and brown types). ...

Fengite is also a variant spelling of phengite, the high silica muscovite variety. Muscovite layer Muscovite, also known as potash mica, is a phyllosilicate mineral of aluminium and potassium with formula: KAl2(AlSi3O10)(F,OH)2. ...