Posted on May 1, 2014 by John Bradshaw, GG (GIA)

Danburite is calcium borosilicate (CaB2(SiO4)2) named after its place of initial discovery, Danbury, Connecticut in Fairfield County. It was discovered in 1839 by Charles Upham Shephard, a prominent mineralogist and assistant to Benjamin Silliman. Silliman…

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