Generally colourless, danburite crystals may also be yellow or pink. They form wedge-shaped prisms, much like the ones from colourless topaz but distinguishable by cleavage (poor in danburite, perfect in topaz) and specific gravity (lower in danburite).
First found in the town of Danbury, Connecticut (USA). Gem-quality danburite occurs in Burma, Mexico, Switzerland, Italy and Japan.
Color center.
Borosilicate of calcium – CaB2(SiO4)2
Orthorhombic System / Prismatic and wedge shaped crystals are common.
Facetted, cabochon, etc.
Crystal inclusions, liquid tubes.
Anisotropic, D.R.; Biaxial positive or negative (depends on wavelengths of light used)
1.630 – 1.636 / 0.006
Topaz (S.G.), Andalusite (pleochroism), Beryl (optic figure, R.I., S.G., inclusions), Quartz (optic figure, R.I., S.G.), Tourmaline (optic figure, R.I., birefringence, inclusions)
Myanmar, Japan, Madagascar, Russia, Mexico.
Slowly attacked by hydrochloric acid.
Sometimes shows line at 580nm (didymium lines – rare earth spectrum).
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