This is a really fantastic specimen of acanthite on quartz from Mexico. The bright acanthites form a roughly octahedral face and are all oriented similarly. Perhaps this was one large acanthite crystal at one point. Golden chalcopyrite crystals are mixed in with the acanthite. Everything rests on a bed of gemmy needle quartz.<BR><BR>
I have made over 60 trips to Guanajuato looking for minerals. Pieces this good are not very common. Especially matrix specimens. A nice hand specimen that measures 7.7 x 4.5 x 3.5 cm. No damage.