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Nouvelle-Zélande
Wheal Mary Ann, Menheniot, Liskeard, Cornwall, Angleterre
In a first view, as a Quartz, it looks rare. And it is rare, because it has the form of octahedral Fluorite, previously existing and substituted by the Quartz. More curious is to observe that the surface is cryptocrystalline Quartz (Chalcedony) but the core of the octahedron, where Fluorite primarily was, is hollow and consists of little geodes covered by Quartz crystals.
www.fabreminerals.com specimen and text Fabre Minerals photo.
