Topaz
-
Al2SiO4(F,OH)2
Description
Crystal in a beautiful limpid blue with a sharp-edged, beveled upper part rich in facets. A thin layer of fluid has been trapped during the crystallization process and displays an iridescence phenomenon.
Mina Xandá, Virgem da Lapa, Minas Gerais
Collection of origin
Houston Museum (USA)
Probable extraction year
1975
For the type locality, Topasos (Zabargad), the Red Sea, Egypt.
Class
Dimensions (length x with x height in cm)
14x18x17
Hardness (Mohs)
8
Density (G/cm3)
3.6
Publication
"Mineralogical Record: Jan-Feb 1992", "Mineralogical Record: Jan-Feb 1995"
