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.
The
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.
Weight
of Specimen: 59.0 g
Chemical
Composition: Al2SiO4(F,OH)2
Hardness
on Mohs Scale: 8
Location:
Spitzkoppe,
Specimen
Code:
US $ 65
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