Mathewrogersite (w. anglesite and kegelite)

anglesite; chalcocite; hematite; kegelite

A shallow vug in a predominantly chalcocite matrix with subordinate red-brown hematite hosts colourless to smoky-brown anglesite crystals (to 2 mm) and abundant sub-mm spherules of pearlescent off-white kegelite. Sparsely distributed among the kegelite spherules are similarly shaped aggregates of pale lemon-yellow mathewrogersite (also sub-mm), with a sub vitreous lustre (Exhibit 2).

The specimen is in the collection of Peter Hall (Melbourne), who acquired it from the estate of the late John Carroll in 2004. Mathewrogersite and kegelite have been verified by analysis by Peter Elliott (South Australian Museum, Adelaide) in 2005. While there is no formal record of the location in the mine the paragenesis has been described by Keller and Dunn (1986) and is diagnostic for the second oxidation zone.