Cymrite from Banded Ores of the Degtyarskoe Massive Sulfide Deposits (Central Ural)

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Resumo

Microinclusions of cymrite was found in banded chalcopyrite-sphalerite-pyrite ores of the Degtyarskoe massive sulfide deposit (Central Urals). The most interesting feature of cymrite is its enrichment in gallium (Ga2O3 up to 2.02 wt. %). Cymrite forms platy aggregates up to 80 μm long and up to 20 μm wide and, less frequently, single platy inclusions up to 40 μm long and 5—7 μm wide in sphalerite. The mineral is intergrown with barite, mica, and chlorite. The chemical composition was determined using electron microscopy and microprobe (the water content was calculated by stoichiometry, wt. %): SiO2 24.29—32.37, Al2O3 23.51—26.15, BaO 33.80—39.66, K2O up to 0.50, Ga2O3 0.30—2.02, FeO up to 1.69, ZnO up to 3.06, H2O 4.04—4.78, total = 98.83—101.96 and maps of the distribution of elements were constructed, which show the monocrystalline nature of the mineral. The empirical formula of the Ga-richest areas in of one grain is (Ba0.92K0.02)0.94(Al1.83Zn0.15Ga0.09Fe0.04)2.10Si1.99O8·H2O. The presence of the mineral is also confirmed by Raman spectroscopy. The Raman spectra with bands at 3499, 1078, 986, 954, 795, 675, 449, 392, 349, 295 and 166 cm−1 are similar to those of the reference spectrum of cymrite from the Rruff.info database № R080032.

Sobre autores

N. Safina

South Ural Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Ilmeny Reserve

Email: natali.safina2015@yandex.ru
Miass, Chelyabinsk region, Russia

E. Belogub

South Ural Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Ilmeny Reserve; Geomodel Resource Center, Saint Petersburg State University

Miass, Chelyabinsk region, Russia; Peterhof, Russia

I. Blinov

South Ural Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Ilmeny Reserve

Miass, Chelyabinsk region, Russia

V. Kotlyarov

South Ural Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Ilmeny Reserve

Miass, Chelyabinsk region, Russia

S. Lebedeva

South Ural Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Ilmeny Reserve

Miass, Chelyabinsk region, Russia

N. Vlasenko

Geomodel Resource Center, Saint Petersburg State University

Peterhof, Russia

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