Australian Prehnite Cabochon #7 Jasper Bivalves are a type of

Bivalves are a type of aquatic mollusc that have a 2 part shell

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These are low in Calcium but high in Potassium

Australian Prehnite Cabochon #7 Jasper Bivalves are a type ofGorgeous soft green Australian Prehnite cabochon. You will receive the exact crystal pictured. Prehnite was actually the first crystal to be named after a person, Dutch mineralogist Hendrik von Prehnwho discovered it in the late 18th Century in South Africa. Although it is most commonly seen in a soft, apple green colour, it can also be found in blue, orange and yellow varieties. The Aborigines of Australia believed that Prehnite could absorb and