Prehnite was first described as a gemstone in 1780, when it was discovered in the Karoo dolerites of Cradock, in South Africa. It was the first mineral to come from South Africa, long before this country became one of the most important gemstone producers. Today, green Prehnite originating from South Africa is also called Cape Emerald. Prehnite is named after its discoverer, Colonel Hedrick von Prehn, the German mineralogist and military officer. He was a governor of Cape of Good Hope, but was also a naturalist and stone collector. Colonel Prehn first brought Prehnite to Europe, and it became the first mineral named after a person....Read more about Prehnite gemstone

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