Chalcedony

 Mega Horio, Serifos Island, Cyclade Islands, Kykládes Prefecture, Aegean Islands Department, Greece A dome of Andradite garnet encloses an underlying matrix of dark olive-green Hedenbergite from the...

 Trevascus Mine, Gwinear, Cornwall, England, Europe A convoluted specimen of rope-like ridged Chalcedony with a translucent light brown to yellow-brown...

 Trevascus Mine, Carnhell Green, Gwinear, Cornwall, England Chalcedony from Trevascus mine at Carnhell Green, between Camborne and Hayle in Cornwall is readily...

 Hüttenberger Erzberg, Hüttenberg, Friesach - Hüttenberg area, Carinthia, Austria Pale milky-white double terminated scalenohedral Calcite crystals to about 5 mm are preferentially...