Minute tabular and blocky yellow rare Stolzite crystals  in  a coating of prismatic yellow-green and unusually for this location brown, Pyromorphite crystals,  These crystals commonly have an outer zone of Wulfenite but are mostly Stolzite.  There's only a handful of places where Stolzite can be found in the UK and these specimens from Poddy Gill are as good as any from the UK.  Requires magnification to be appreciated.