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Smoky topaz

Smoky quartz Cairngorm Smoky topaz Morion (black) Gray, brown, black, transparent to opaque Terminated hexagonal prisms rarely massive... [Pg.24]

The destruction of color centers (1,3) by heating can result in bleaching or fading. Examples are brown or blue topaz, red tourmaline, smoky quartz, and some yellow sapphire. In other instances there may be a color change as when amethyst turns into yellow citrine, or when the heating of a brown topaz reveals the presence of a previously hidden Cr-derived color in a pinked topaz. These changes can usually be reversed by an irradiation treatment. [Pg.221]

See other pages where Smoky topaz is mentioned: [Pg.163]    [Pg.358]    [Pg.35]    [Pg.12]    [Pg.13]    [Pg.163]    [Pg.358]    [Pg.35]    [Pg.12]    [Pg.13]    [Pg.222]    [Pg.223]    [Pg.1397]    [Pg.47]    [Pg.269]   
See also in sourсe #XX -- [ Pg.24 , Pg.35 ]



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Smoky

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