General Information:
Chemical Formula:NaNa2(Mn++2Mn+++3)Si8O22O2
Composition:(Molecular Weight = 952.33 gm)Sodium 7.24 %
NaManganese 28.84 %
MnSilicon 23.59 %
SiOxygen 40.32 %
O Empirical Formula: Na3Mn2+2Mn3+3Si8O24
Environment:Manganiferous silicate and oxide rocks.
IMA Status:Approved IMA
Locality:The abandoned Hoskins Manganese mine, 3 km west of Grenfell, New South Wales, Australia.
Name Origin:Named after Prof. Luciano Ungaretti (1942-), Universita de Pavia, Pavia, Italy.
Physical Properties: Cleavage:[110] Perfect
Color:cherry red or very dark red.
Density:3.52
Diaphaniety:Transparent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:6 - Orthoclase
Luminescence:Non-fluorescent.
Luster:Vitreous - Adamantine
Streak:pale pinkish white
More details...
