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Ungarettiite is a new amphibole species from the Hoskins mine, near Grenfell, New South Wales, Australia. It occurs with Mn-bearing oxides, silicates, and carbonates in a stratiform schist associated with metajasper, metabasalt, and metasiltstone. Ungarettiite is brittle, H = 6, D meas  = 3.52 g/cm 3 , D calc  = 3.45 g/cm 3 . In plane-polarized light, it is strongly pleochroic, X = orange red, Y ~ Z = very dark red; X Λ a = -2° (in β acute), Y = b, Z Λ C= 17° (in β obtuse), with absorption X &lt; Y ≤ Z. Ungarettiite is biaxial positive, α = 1.717(2), β = 1.780(4), γ= 1.800(2); 2V= 51(2)°, dispersion r &lt; ν. Ungarettiite is monoclinic, space group C2/m, a = 9.89(2), b = 18.04(3), c = 5.29(1) Å, β = 104.6(2)°, V = 912(1) Å 3 , Z = 2. The strongest ten X-ray diffraction lines in the powder pattern are [d(I, hkl )]: 2.176(10,171), 3.146(9,310), 2.544(9,2̅02), 1.447(9,3̅.11.1), 3.400(8,131), 1.656(8,461), 8.522(7,110), 2.299(7,1̅71), 2.575(6,241), and 2.047(6,202). Analysis by a combination of electron microprobe and crystal-structure refinement gives SiO 2  50.66, Al 2 O 3  0.04, TiO 2  0.03, Fe 2 O 3  0.50, FeO 0.00, Mn 2 O 3  24.35, MnO 12.42, MgO 1.46, ZnO 0.10, CaO 0.18, Na 2 O 9.13, K 2 O 0.76, F not detected, sum 99.63 wt%. The formula unit calculated on the basis of 24 O atoms is (K 0.15 Na 0.82 )(Na 1 . 97 Ca 0.03 )(Mn 2+  1.66 Mg 0.34 - Mn 3+  2.96 Fe 3+  0.06 Zn 0.01 )(Si 7.99 Al 0.01 )O 2  and is close to the ideal end-member composition of NaNa 2 (Mn 2+  2 Mn 3+  3 )Si 8 O 22 O 2 .

american mineralogist

A new anhydrous amphibole from the Hoskins mine, Grenfell, New South Wales, Australia: Description and crystal structure of ungarettiite, NaNa 2 (Mn 2+  2 Mn 3+  3  )Si 8 O 22 O 2