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Amphibole Supergroup (Var: Uralite)

Locality: Calumet Mine (Calumet; Calumet No. 2; Hecla; Hecla No. 2; Calumet Iron Mine; Calumet-Hecla-Smithville Magnetite Deposit; Patented Placer Claims: Calumet; Hecla-Williamson; Smithville No. 2; CF&I Company Mine), Turret District, Chaffee Co., Colorado, USA

17.2 x 11.6 x 9.8 cm. This large cabinet specimen comes with a Gary Hansen label. It is a rich example of Colorado uralite, the name given pseudomorphs of hornblende group minerals, mainly actinolite, after a pyroxene group mineral. Here, you have blocky actinolite pseudomorphs after diopside crystals, richly covering the whole side of the specimen. The crystals measure to 1.5 cm. Hard to find on the market now!

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Photo added: 8th Aug 2007

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