Proustite, one of two silver sulphosalts known as ruby silver (the other being Pyrargyrite), is an extremely desirable mineral for collectors. This is in part because of its wonderful blood-red colour, but also its rarity in good crystals. This thumbnail specimen, consisting of a small aggregate of well-formed crystals, has been mounted upon an inverted glass stopper. We do not know when this was done, but it is certainly an unusual, but effective way to display a specimen. The Proustite aggregate is dominated by a 11 mm tall well-formed trigonal crystal with great red colour and internal translucency. Surrounding the base of that crystal are small, but equally well-formed Proustite crystals to 4 mm in length. The specimen is from Niederschlema, Schlema, Schlema-Hartenstein District, Erzgebirge, Saxony, Germany, making it a European classic. A top class silver-bearing specimen for the discerning collector.