Yes, it is perfect in one direction, basal.
Topaz has both cleavage and fracture because it has distinct planes of weakness along which it can break cleanly (cleavage), as well as areas where the mineral breaks irregularly and unevenly (fracture) when subjected to stress. Cleavage in topaz occurs along its basal plane due to its crystal structure, while fractures can happen when the stress applied is not along the cleavage planes.
Yes, topaz has perfect basal cleavage. This means it can be easily split along a specific plane, usually resulting in smooth, flat surfaces.
Topaz are Insoluble in acids. It has great hardness and perfect basal cleavage. Even though, Topaz jewelry should not be ultrasonically cleaned; the vibration can cause incipient cleavage cracks to open, cleaving the stone. Some treated stones (particularly the expensive reds, pinks, violets and deep oranges, but not blue) are known to fade with prolonged exposure to direct sunlight.
it is a December birthstone a yellow topaz is a November birthstone
you can find blue topaz in Brazil, Sri Lanka, Pakistan and Russia!
Cleavage refers to how a mineral breaks and how the atoms are positioned. Cleavage is measured in the following ways: quality of cleavage, the number of sides exhibiting cleavage and the cleavage habit and in the case of a diamond it is all sides.
Topaz usually shows up as being a yellow color in it's pure state. Blue topaz appears as blue in it's natural state.
Pure topaz is colorless and transparent but is usually tinted by impurities; typical topaz is wine, yellow, pale gray, reddish-orange, or blue brown. It can also be made white, pale green, blue, gold, pink (rare), reddish-yellow or opaque to transparent/translucent.
the density of the blue topaz is the mass divided by the volume
Blue topaz is a type of gemstone that belongs to the silicate mineral family. It is formed from the mineral topaz with the presence of certain trace elements which give it its distinctive blue color.
See this link. Do not believe in the fantastic qualities of topaz !
yellow topaz November Gemstone: Citrine, Yellow Topaz November Birthstone Color: Yellow