A very rich group of quartz crystals, some of them doubly terminated, with well defined faces and edges. Interesting elongated prism and terminal faces. We would like to emphisize the delicate filamentous inclusions that can be seen inside through transparency.
These inclusions are of unknown composition, but probably due to fluid inclusions originated during the crystal growth. They are accompanied by curious hemispherical aggregates of goethite-limonite, with a intense orange color, formed after the quartz crystals. From a known mining area, but these specimens are not well represented in collections.