Mineral Species: Bayldonite

Chemical Formula: (Cu,Zn)3Pb(AsO4)2(OH)2

Chemical Name: Hydrated Copper Lead Arsenate Hydroxide

Mineral Class: Arsenate

Mineral Notes: Bayldonite is a rare secondary mineral occurring in the oxidized zone of some polymetallic deposits. It is named after John Bayldon, English physician who collected the original specimens.

Description: Botryoidal clusters of Bayldonite on yellow-brown Quartz matrix. The mineral has a very pronounced resinous luster. Magnification shows individual crystals as small radiating fibers.

Location: Penberthy Croft Mine, St. Hilary, Cornwall, England. (Type Location)