New Mineral Names

Abstract

### Dashkovaite* N.V. Chukanov, D.I. Belakovsky, S.V. Malinko, N.I. Organova (2000) Dashkovaite Mg(HCO3)2·2H2O — A new formate mineral. Zapiski Vseross. Mineral. Obshch., 129(6), 49–53 (in Russian, English abs.). Chemical analysis gave C 16.2, H 3.9, Mg 16.4, Mn (by electron microprobe) 0.2, O (by difference) 63.3, sum 100 wt%, corresponding to Mg1.00Mn0.01H5.74C2.00O5.87, ideally Mg(HCO3)2 2H2O. The mineral occurs as white, fibrous aggregates in hydrothermal veinlets, up to 1 mm in width, wherein the fibers are up to 3 mm long and 0.01 mm wide. Soft and porous, H = 1, D calc = 1.74 g/cm3 for Z = 4. Microscopically colorless, biaxial positive, α = 1.465(3), α = 1.486(3), γ = 1.516(3), 2 V calc = 81(5)°, X parallel to the elongation. By analogy with the synthetic analog, indexing of the X-ray powder pattern gave a monoclinic cell, space group P 21/ c , a = 8.64(1), b = 7.15(1), c = 9.38(1) A, α = 98.0(1) °; strongest lines of the pattern (57 mm camera, Fe K α radiation) are 4.90(90,111), 4.64(80,002), 4.30(70,200), 3.68(80,210), and 3.40(100,112). The IR spectrum is similar to that of the synthetic compound. The mineral occurs with shabynite, iowaite, ekaterinite, korshunovskite, halite, hydromagnesite, and serpentine in dolomite marble at the Korshunovskoye boron deposit in the Irkutsk district, Siberia. The new mineral name is for E.R. Dashkova (1744–1810), former Director of the Saint Petersburg Academy of Sciences (1783–1796) and President of the Russian Academy of Sciences. Type material is in the Fersman Mineralogical Museum, Moscow, Russia. J.L.J. ### Fluorannite* Ganfu Shen, Qi Lu, Jinsha Xu (2000) Fluorannite: A new mineral of the mica group from the western suburb of Suzhou City. Acta Petrologica Mineral., 19(4), 355–362 …