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November Birthstone - Topaz
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Topaz fact file
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Crystal Structure: orthorhombic
Chemical Composition: fluosilicate of aluminum
Hardness: 5-6 MOHS
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Refractive Index: colorless and blue topaz - 1.610 to 1.617
yellow and brown topaz - 1.630 to 1.637
Colors: Many colors including pink, blue, lavender, yellow, orange, orange-yellow,
brownish yellow, yellow-brown, red, and colorless
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Topaz, the November birthstone along with Citrine,
has all the colors of the setting sun - Brown,
yellow, orange, sherry, red and pink.
It is said to cure insomnia, asthma, and
hemorrhages. Topaz crystals may become quite large and finished gems weighing
several thousands of carats are seen in many museum collections.
Name
Topaz may have derived its name from the Island of Topazios in the Red Sea but
some authorities think the name may have come from the Sanskrit word "topas" that
means "fire."
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