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The following information is from the website:-
http://en.wikipedia.org/wiki/Topaz
Topaz
is a
silicate mineral
of
aluminium
and
fluorine
with the
chemical formula
Al
2
Si
O
4(
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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The hardness (Mohs scale) : 8
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