Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces.
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Famous quotes containing the word topaz:
“Aunt Jennifer’s tigers prance across a screen,
Bright topaz denizens of a world of green.”
—Adrienne Rich (b. 1929)