geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Gallobeudantite, PbGa (sub 3) (sub 2) (OH) (sub 6) , a new mineral species from Tsumeb, Namibia, and associated new gallium analogues of the alunite-jarosite family


, : Gallobeudantite, PbGa (sub 3) (sub 2) (OH) (sub 6) , a new mineral species from Tsumeb, Namibia, and associated new gallium analogues of the alunite-jarosite family. The Canadian Mineralogist 34, Part 6: 1305-1315

Gallobeudantite, ideally PbGa (sub 3) [(AsO (sub 4) ),(SO (sub 4) )] (sub 2) (OH) (sub 6) , is the newly defined Ga analogue of beudantite. It occurs as zoned rhombohedra, up to 200 mu m along an edge, in vugs in a single specimen of massive Cu-bearing sulfides from Tsumeb, Namibia. Gallobeudantite is variably pale yellow, greenish, or cream-colored, with a white to pale yellow streak, vitreous luster, even to conchoidal fracture, hardness of 4, and D(calc.) 4.61 g/cm (super 3) for Z = 3. The mineral is nonpleochroic, uniaxial negative, omega 1.763(5), epsilon 1.750(5). A single-crystal X-ray refinement of the structure (R = 0.078) showed the mineral to be rhombohedral, space group R3m, a 7.225(4), c 17.03(2) Aa, and isostructural with corkite. The strongest lines of the X-ray powder-diffraction pattern [d in Aa (l)(hkl)] are: 5.85(90)(101), 3.59(40)(110), 3.038(100)(113) and 2.271(40)(107). Within the crystals, in addition to gallobeudantite, are zones containing Ga-rich beudantite and hidalgoite, and the unnamed Ga analogues of segnitite, corkite, kintoreite, and arsenocrandallite. The last contains up to 12.7 wt.% GeO (sub 2) , which is about 75% of the Ge substitution possible if the formula is assumed to be Ca(Ga,Al,Fe) (sub 2) Ge (super 4+) (AsO (sub 4) ) (sub 2) (OH) (sub 6) . The new name gallobeudantite alludes to the predominance of Ga in the position occupied by Fe (super 3+) in beudantite-type minerals.

US$29.90


Other references

Czajka, S.; Markiewicz, A.; Kubit, S.; Dorska, H.; Mardón, K., 1972: Registered morbidity of active pulmonary tuberculosis in the area covered by the activities of Tuberculosis Research Center in 1964-1967. Gruzlica i Choroby Pluc; Tuberculosis et Pneumonologia 40(11): 1043-1051

Fox, I.J.; Castaneda, A.R.; Weber, K.C., 1964: Abnormal Indicator Dilution Patterns In Dogs Produced By Flowmeter Probes On The Pulmonary Artery. In 16 of 32 open chest dogs with a flowmeter probe (Model C1 Flo-Probe, Medicon) on the pulmonary artery, the indicator dilution curves recorded at the femoral artery following injections of dye into the right ventricle were abnormal, resembling c...

Warburg, M., 1955: A case of symmetrical muscular contractures due to sarcoidosis. Journal of Neuropathology and Experimental Neurology 14(3): 313-315

Martin, R.S.; Luong, L.A.; Welsh, N.J.; Eglen, R.M.; Martin, G.R.; Maclennan, S.J., 1999: Cannabinoid CB1 receptors mediate inhibition of neuronally-evoked contractions of isolated urinary bladder from the rat and mouse, but not human, pig, dog or monkey. British Journal of Pharmacology 128(PROC SUPPL ): 103P, Oct

Chapman, G.P., 1983: The growth of large cities in India, 1961-1971. "The general characteristics and the growth 1961-1971 of class 1 cities (those with more than 100,000 population in 1971) in India are examined. An unexpected correlation shows that the larger cities are more specialized, and growing faster....

Zhang, Y-Liang.; Guo, Y-Jun.; Bin Li; Sun, S-Han., 2009: Hepatitis C virus single-stranded RNA induces innate immunity via Toll-like receptor 7. Innate immune responses to HCV infection are triggered through host recognition of pathogen-associated molecular patterns. Interferons are critical for the protection against HCV infection. However, the pathways linking virus recognition to IFN in...

Chan, J.Y.H.; Wang, L-Lin.; Ou, C-Chun.; Chan, S.H.H., 2003: Downregulation of angiotensin subtype 1 receptor in rostral ventrolateral medulla during endotoxemia. We reported recently that an upregulation of the inducible nitric oxide synthase (iNOS) in the rostral ventrolateral medulla (RVLM), where sympathetic premotor neurons are located, is a crucial determinant for the elicitation of cardiovascular dep...

Lachance M A.; Starmer W.T.; Phaff H.J., 1990: Metschnikowia hawaiiensis new species a heterothallic haploid yeast from hawaiian morning glory and associated drosophilids. A new haploid, heterothallic yeast species was isolated repeatedly from morning glory (Ipomoea acuminata) flowers and from two associated drosophilid species, Scaptomyza calliginosa and Drosophila floricola, in a Hawaiian [USA] kipuka. Haploid str...

R.Haye, 1974: The connective tissue in the middle ear mucosa of the guinea pig. European Archives of Oto-Rhino-Laryngology 208(3): 185-191

Figiel, L.S.; Figiel, S.J.; Wietersen, F.K., 1962: Roentgenologic observation of growth rates of colonic polyps and cancer. Retrospective and progress study of roentgenographically confirmed colonic polypoid lesions has proven of immeasurable value in expanding our knowledge of the significance and the probable relationship of the colonic polyp and colonic cancer. We h...