Cobaltaustinite (rare) with Calcite

Item Description

Cobaltaustinite is a rare calcium cobalt arsenate mineral, and the cobalt-analogue of Austinite and Nickelaustinite. Some of the best examples of the species are those from Aghbar in Morocco. This piece is a showy example featuring rich green colored crystals which are intergrown / included within prismatic, trigonal, gemmy colorless crystals of Calcite on matrix. The piece is best seen with magnification, and we've done our best to illustrate the quality in the close-up photos. From the collection of Vasco Trancoso, a medical doctor and prominent mineral collector from near Lisbon, Portugal (https://www.mindat.org/user-11954.html). He assembled his mineral collection over the course of 60 years, and built a fine worldwide display collection that we recently purchased. This piece is pictured on mindat.org at https://www.mindat.org/photo-186339.html