Encyclopedia of Science
GEOLOGY & PLANETARY SCIENCE
A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

                   • HOME
• ABOUT
• CATEGORIES
• USE OF TEXT AND IMAGES
• NEWSLETTER

  



topaz


topaz
An aluminum silicate mineral of composition Al2SiO4(F,OH)2, forming prismatic crystals in the orthorhombic system which are variable and unstable in color, and valued as gemstones. The best topazes come from Brazil, Siberia, and the United States.


Related category

   • GEOLOGY AND PLANETARY SCIENCE


Also on this site:

Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History


BACK TO TOP