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Topaz occurs in a wide range of colors and in many different shades.
Golden yellow topaz and pink topaz are the most prized.
Unfortunately, they naturally pink stones rare so that most pink available are yellow topazes that have been heated.
Much colorless topaz is heated and irradiated to adopt different shades of blue.
It can be difficult to distinguish one from a heated aquamarine topaz with the naked eye.
Inclusions that a topaz may have are cracks, veils and streaks.
The Topaz may have inclusions in the form of teardrop-shaped gas bubbles with liquids.

The topaz found in volcanic rocks and can be found in eg Brazil, USA, Sri Lanka, Myanmar (Burma),
Australia, Pakistan, México, Japan and África. In Russia and Pakistan are deposits of pink topaz.

Crystal structure: orthorhombic
Composition: Aluminum fluoro-hydroxyl-silicate
Hardness: 8
Density: 3.54
Refractive index: 1.62 to 1.63
Birefringence: 0.010
Finish: Glass

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