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.
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