Mark Valley Mine, Upton Cross, Linkinhorne, Cornwall.
A matrix of chlorite, quartz and minor chalcopyrite, with cavities lined with groups of sky-blue, acicular scorodite crystals to 3 mm across, accompanied by numerous tiny yellow cubic crystals of pharmacosiderite.
An excellent and rare specimen for the locality.
Ex. Richard Hotson Collection bought from Richard Barstow.
Size: 7 x 6 x 4.5 cm
