Mineral: Osumilite, Tridymite
Locality: Funtanafigu Quarry, Marrubiu, Arci Mountain, Oristano Province, Sardinia/Sardegna, Italy
Dimensions: 12 x 10 cm

Description: Exagonal (actually dodecagonal because of a second order of faces), dark blue, lustrous prisms of Osumilite up to 3 mm on a bed of Tridymite.

All pictures, text, design © Forum FMF 2006-2024