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Herderite
 

	Herderite is an attractive yet very rare mineral. It was named for Siegmund August Wolfgang Von Herder (1776-1838), mining official in Freiberg, Saxony, Germany where it was first discovered.
	Its twinned crystals (i.e. one crystal growing within another) are its most note worthy form.
	One of Herderite’s other characteristics is that it is thermoluminescent, meaning it may glow with a weak blue light upon extreme heating. It is also sometimes fluorescent, showing deep blue in long wave ultraviolet light.
	Herderite can have a colorless, white, yellow, green or light blue color.
	Herderite is found Brazil, Germany, Russia and U.S.A.