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.

Techinical Specification

Name	Moh's	Specific Gravity	Structure	Cleavage	Refractive Index	Double	Disp.	Pleochro	Fluorescence
Topaz	8	3.53-3.56	Orthorhombic	Perfect	1.610-1.638	0.008 -0.01	0.014	Definite to weak	Weak