beudantite (w. carminite and gartrellite)

The bulk of this specimen comprises beudantite but in a variety of habits (exhibits 1 and 2). These include (a) yellow-green botryoidal; (b) pseudo-hexagonal tabular crystals (to 1 mm) with yellow cores and orange-brown rims; (c) massive, yellow-brown powdery beudantite and (d) intergrowths of golden yellow-green crystals (to 0.5 mm). Also present in very minor amounts are groups of acicular red carminite crystals and minute microcrystals of gartrellite (to circa 0.1 mm). All three minerals have been verified by quantitative electron microprobe (WDS) analysis (University of Queensland, February 2022). All four habits of beudantite have been analysed by quantitative WDS and found to be of very similar composition (Exhibit 3).

The specimen was purchased from Chris Amo in 2017. Amo bought it from John Schneider (in 2013) who acquired it from Marshall Sussman. It is accompanied by a Carlton M. Davis Collection label (number 43.1.1.1).

Although there is no record of its location in the mine the paragenesis is strongly indicattive of a second oxidation zone origin.

carminite; gartrellite