Bertrandite on Aquamarine (old Colorado!) Hauck Coll.

Item Description

A historic, old-time and rare Colorado combination thumbnail from the Columbia University and Richard Hauck Collections. Glassy, tabular bertrandite crystals to 4 mm are richly clustered on two sides of the lustrous, blue-green aqumarine crystal. This is a RARE, classic and representative Mt. Antero combination piece. One old label has Thomas Egleston named on the back. Thomas Egleston founded the School of Mines at Columbia University in 1864 and was Professor of Mineralogy and Metallurgy until he retired in 1897. The rare mercury oxyhalide, eglestonite, is named after him. A rare, old piece with a fine provenance. Value??? Hard to say, but we estimate in the $300-500 range.