Description
Prehnite from St Christophe-en-Oisans, Bourg d’Oisans, Isre, Auvergne-Rhne-Alpes, France. Comes with certificate of authenticity. Average weight (Carats): 1776.0 carats. Dimensions (mm): 100 x 55 x 40 mm. Ref. : SKU037544. Calcium aluminum silicate formed in the cavities of volcanic rocks. Used for green cabochons.
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