Measurements: 42 x 25 x 21 mm
Description: A topaz crystal with a very faint blue colouring and inclusions of, what appears to be, extremely minute air bubbles.
The upper part of the crystal has a good transparency, especially when viewed from the longest, wide shaft facet. When tilted in light, a pretty rainbow can be seen in the upper half of the shortest shaft facet, just above the pressure mark.
termination edge has a nick of about 5 mm wide, while the rest of the
crystal has a few small nicks and a large, neat pressure mark, and two
small ones. The specimen displays well on a flat surface, in an upright position.
Chemical Composition: Al2SiO4(F,OH)2
Hardness on Mohs Scale: 8
US $ 65