Danburite
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Danburite is a crystalline mineral similar to topaz. Its chemical formula is CaB2(SiO4)2. It has a Mohs hardness of 7 to 7.5 and a specific gravity of 3.0. The mineral has an orthorhombic crystal form. It is usually colourless, like quartz, but can be also either pale yellow, yellowish-brown, or pink. It typically occurs in contact metamorphic rocks.
It is named for Danbury, Connecticut, United States where it was first discovered in 1839 by Charles Upham Shephard.
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