SMITHITE (REDDISH), DUFRENOYSITE (BLACK), REALGAR (micro, miniature)

A very rare and older specimen from the Lengenbach Quarry.

Dufrénoysite was first identified in the Lengenbach pit located in the Binn Valley of Switzerland's Valais canton. The mineral was described in 1845 by Augustin Alexis Damour, who named it in honor of the French geologist and mineralogist Armand Dufrénoy. In 1864, Julius Berendes further explored the properties of this mineral in his dissertation.

Smithite is a sulfosalt mineral characterized by the chemical formula AgAsS2. It was first identified by mineralogist R H Solly in 1905 from specimens collected at the Lengenbach quarry near Binn, Switzerland. The mineral is named in honor of Herbert Smith, who served as an assistant in the mineralogy department of the British Museum (Natural History). Notably, smithite is a dimorph of trechmannite.