Prehnite
Prehnite, a semi-precious pale green gemstone, forms in the cavities of volcanic rock and is found in granite. Named in 1788 in honor of the Dutch colonel, Von Prehn was the governor of the Cape of Good Hope in South Africa. This gem was the first to be named after a person. Not an official birthstone, it has been known to be associated with the astrological sign Libra.
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