Andrewsite (a mixture of Hentschelite-Rockbridgeite-Chalcosiderite)

A rare and highly sought miniature specimen of Andrewsite from Phoenix United mine at Minions close to Linkinhorne in Cornwall.  Although Andrewsite was discredited as a true species in 1990, it remains one of those “must have” Cornish classics.  It is now known to be a mixture of Hentschelite and Rockbridgeite with minor Chalcosiderite.  The specimen displays several spherulites of light green grey Andrewsite measuring to 2 mm diameter.  The interiors of the spherulites show fibrous concentric banding associated with well-developed crystals of Chalcosiderite.  The Andrewsite and Chalcosiderite have formed on brown-black Goethite and white Quartz.  A classic and rare specimen of Andrewsite from Wheal Phoenix where it was first discovered.