An unusual architecturally interesting specimen consisting of a mass of thick prismatic crystals with slightly curved terminations clustered together around a central depression to form a significant dome. There is a rich scatter of olive green acicular crystals of epidote and a thin covering of grey chlorite? crystals.
8.0cms x 7.5cms x 5.0cms.
Bouarfa, Morocco.
ex Potts Collection #278, with a "Secured Minerals" label describing the specimen as 'pseudomorph of chlorite after prehnite'.