Juangodoyite, Na2Cu(CO3)2, a new mineral from the Santa Rosa Mine, Atacama Desert, Chile

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Erscheinungsjahr:
2005
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Schlagworte:
  • Juangodoyite
  • new mineral
  • chalconatronite
  • sodium bis(carbonato)cuprate(II)
  • Chile
  • Atacama
  • Santa Rosa mine
Beschreibung:
  • The new mineral juangodoyite has the ideal chemical formula Na2Cu(CO3)2. It is monoclinic with space group P21/a. Cell parameters refined from X-ray powder diffraction data are (Å) a = 6.171(4), β = 8.171(5), c = 5.645 (4), b = 116.23 (2)°, V = 255.33 (15) Å3, Z = 2. Juangodoyite is isostructural with synthetic sodium bis(carbonato)cuprate(II). The strongest reflections in the X-ray powder diffraction data are as follows: [dmeans. (Å), I, (hkl)]: 2.666 (100, 11-2), 4.258 (75, 11-1), 5.056 (66, 001), 2.619 (65, 210) and 4.575 (57, 110). Juangodoyite was found at the Santa Rosa mine near Iquique, Atacama desert, northern Chile. It occurs as fine-grained pseudomorphs, with crystallites up to 5 μm in size, after small laths of chalconatronite (Na2CU(CO3)2 · 3H2O). Its colour is a vivid ultramarine blue. The calculated density is 2.984g/cm3, the calculated average refractive index is 1.571. Juangodoyite is closely associated with chalconatronite, malachite, calcite, anhydrite and sodium hydrogen carbonates. Chemical analyses gave (wt. %) Na2O 28.27, CuO 33.77, CO2 38.45, sum 100.49. The resulting empirical formula calculated on the basis of 6 anions is Na2.08Cu0.98(C1.99O6). The mineral wa s named after Juan Godoy, discoverer of the Chañarcillo silver mine. © by E. Schweizerbart'sche Verlagsbuchhandlung 2005.
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Forschungsinformationssystem der UHH
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