Danburite derives its name from Danbury, Connecticut where it was first discovered in 1839. By chemical composition, danburite is a calcium aluminum borate silicate. It is quite hard, with a rating of 7 to 7.5 on the Mohs scale. Danburite is usually colorless to very light pink in color, but some deposits may produce specimens in shades of light yellow or brown. Danburite is known for its excellent transparency and clarity.
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