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NEW MINERAL NAMES^*

¹ Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
² Institute of Geological Sciences, University of Wroclaw, Cybulskiego 30, 50-205 Wroclaw, Poland
³ Geological Survey of Canada, 601 Booth Street, Ottawa K1A 0E8, Canada

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Belloite^*
J. Schlüter, K.-H. Klaska, G. Gebhard (2000) Belloite, Cu(OH)Cl, a new mineral from Sierra Gorda, Antofagasta, Chile. Neues Jahrb. Mineral. Mon., 67–73.

Electron microprobe and CHN analysis gave CuO 68.84, Cl 26.35, H₂O 7.47, O Cl 5.96, sum 96.70 wt%, corresponding to Cu_1.05(OH)_1.00O_0.10Cl_0.90. The mineral occurs as yellowish green to olive-green incrustations and masses in which individual grains are up to 100 µm. Vitreous luster, transparent to translucent, soft, yellowish green streak, nonfluorescent, D_calc = 3.79 g/cm³ for the empirical formula and Z = 4. Unstable in non-desert conditions, and converts in water to botallackite and atacamite. In transmitted light, weakly pleochroic from yellowish green to pale yellowish green, n_calc = 1.85 for the ideal formula and the Gladstone–Dale relationship. The X-ray powder pattern is in good agreement with that of the synthetic analog, which is monoclinic, space group P2₁/a; calculated dimensions from the powder pattern of the mineral (diffractometer, CuK radiation) are a = 5.552(3), b = 6.668(2), c = 6.124(2) Å, ß = 115.00(3)°, and strongest lines are 5.553(100,001), 2.758(52,11&,12&), 2.516(18,200), 2.241(27,12&) and 1.851(21,21&,003).

The mineral is associated with nitratine and paratacamite in quartz-feldspar-tourmaline rock from an abandoned mine at Sierra Gorda, near Antofagasta, Chile. The new mineral name is for Andrés Bello (1780–1865), founder and first rector of the Universidad de Chile. Type material is in the Mineralogical Museum of the University of Hamburg, Germany. J.L.J.

Edgarite^*
A.Y. Barkov, R.F. Martin, Y.P. Men’shikov, Y.E. Savchenko, Y. Thibault, K.V.O. Laajoki (2000) Edgarite, FeNb₃S₆, first natural niobium-rich sulfide from the Khibina alkaline complex, Russian Far North; evidence for chalcophile behavior of Nb in a fenite. Contrib. Mineral. Petrol., 138, 229–236.

The mineral occurs as individual platy crystals, up to 0.15 mm in the longest . . . [Full Text of this Article]

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				R. F. Martin and W. H. Blackburn ENCYCLOPEDIA OF MINERAL NAMES: SECOND UPDATE Can Mineral, August 1, 2001; 39(4): 1199 - 1218. [Full Text] [PDF]