PPearls, Peridot, Pietersite, Prehnite, Pyrite
PrehniteNamed after Colonel von Prehn, the Scottish variety of stone is green. Other forms include a dark brownish variety in Australia and aggregate crystal forms in France. Prehnite, a form of calcium aluminum silicate, has a vitreous mother-of-pearl luster. Affordably priced for its size, prehnite makes distinctive and interesting jewellery.
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