Description :
What is topaz?
Topaz crystals are gemstones from traditional times,
despite the fact that they went under the forename of
"chrysoprasios", the yellow stone, and not "topazios". Earlier
topaz was possibly lumped jointly with other yellow gems, such as yellow
sapphire, beryl and chrysoberyl. The majority people recognize topaz as a
yellow gemstone, and in trinkets it is observed most generally in a variety of
tints from pale yellow to rich brown.
Where do they form?
Topaz is a silicate stone of aluminum and fluorine.
Its chemical formula is Al2SiO4 (F, OH) 2. It crystallizes in the orthorhombic
collection and its crystals are more often than not prismatic finished by
pyramidal and additional faces, the basal pinacoid frequently being there.
Composition in topaz:
Composition:Topaz is nesosilicate having the
composition as Al2 [(F, OH) 2/SiO4.
Hardness:8 (Mohs)
Refractive Index:1.609-1.643.
Specific Gravity:3.53 В± 0.04.
Dispersion:0.014
Crystal System:Orthorhombic crystal system.
Physical Properties :
Color:
Color of topaz is an essential feature to be kept in
mind while making the acquisition. Topaz is obtainable in multiplicity of
colors. Occasionally these colors are as predictable occurs else it is colored
by the color center. Topaz hold chromium that is a contaminated, which when
heated at about 4500 F creates unusual shades of red, orange and sometimes
violet. These colors are scrutinized appropriately below an appropriate light source.
Clarity:
This translucent and clear gemstone encloses vitreous
luster. Therefore, it more often than not possesses the clarity. At times, a
small number of of the topaz crystals have certain inclusions that are in
tear-shaped crater. Shades of red colored topaz consist not as much of clarity
than other colors.
Cut:
Cut of the stone is very imperative too. Topaz has
just right basal cleavage; as a result, it is relatively trouble-free to cut.
Frequently it is cut as stretched out stones and gets emerald cuts, lengthened
ovals, and cushion and pears figures. The pear shape with excessively slender
shoulders is the shape that keeps the heaviness of the gemstone.
Natural Occurrence :
Mines of topaz are located in Australia, Namibia,
Nigeria, Russia, Pakistan, Brazil, and the U.S.A.
Available Colors :
Colorless, blue, orange, pink, purple, brown, yellow,
red, violet and light green.