Topaz
A
mineral of somewhat varying composition belonging to the silicate
group. It is not a quartz and therefore has nothing in common with
citrine quartz, a far less valuable stone. True topaz may be yellow,
gold, pink, blue, green, mauve or red It does not reflect the light to
any great extent; so the larger the stone the better. It is widely
used in jewelry making and frequently imitated by citrine quartz.
It comes from Brazil, where it is as widespread as amethyst,
Australia, Madagascar, USA, Mexico and Ceylon.
|
Name |
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|
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| Topaz |
8 |
3.53-3.56 |
Orthorhombic
|
Perfect
|
1.610-1.638
|
0.008
-0.01 |
0.014
|
Definite to weak
|
Weak |
|
