Pyromorphite on Coronadite

The famous MMM mine at Broken Hill in Australia worked the line of lode orebody and is situated within the city of Broken Hill towards the north-east.  This 6 x 4 cm miniature has Pyromorphite crystals coating both sides of a flat plate of Coronadite, a lead-manganese oxide of matt, sooty black appearance.  The Coronadite is mainly masked by the butterscotch toffee coloured Pyromorphite and a very light creamy-tan fine-grained altered sandstone.  The Pyromorphite forms glassy, parallel sided prisms with a simple, flat pinacoid, the latter often a slightly lighter shade than the prism.  The crystals range between 1 and 5 mm long and where they contact the Coronadite, appear a greyish graphite-tinged pale orange.  The base and edges are coated with fine acicular Pyromorphite crystals of pale straw to limey lemon.