5MY36R8: Group of twinned prismatic crystals, elongated, translucent, with sharp faces and edges and with rounded ends. A secondary lead mineral produced by the weathering of galena and other lead minerals.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1978)

Specimen size: 5.8 × 4.5 × 4.3 cm = 2.28”

Main crystal size: 5.5 × 2 cm = 2.17”