Bulletin Mineralogie Petrologie

Vrtiška Luboš, Malíková Radana, Soumar Jan, Macek Ivo, Čejka Jiří

Ročník 23, číslo 2 (2015), strana 247-254

gibbsite, natrolite, zeolite, chemical composition, powder X-ray diffraction data, unit-cell parameters, Hammerunterwiesenthal, Erzgebirge Mts., Germany, Raman spectroscopy

The new occurrence of well-crystaline Al-hydroxide, gibbsite, was found in the Hammerunterwiesenthal tephrite quarry in Erzgebirge (Germany). Gibbsite forms lustrous transparent pseudo-hexagonal tabular crystals, their twins and groups up to 3.5 mm in size. Gibbsite is monoclinic, space group P2₁/n with following unit-cell parameters: a 8.669(2) Å, b 5.070(2) Å, c 9.720(3) Å, β 94.54(3)°, V 425.9(2) ų. Chemical analyses yield the average composition Al₂O₃ 65.48, SiO₂ 0.04, H₂O_calc. 34.74, total 100.26 wt. % corresponding to the formula Al(OH)₃ on the basis of 1 atom in cation sites. Raman spectrum is in good coincident with published data for this mineral phase and is considerably different from Raman spectra of another Al(OH)₃ polymorphs. Gibbsite was found in the close association of natrolite. Natrolite is orthorhombic, space group Fdd2 with following unit-cell parameters: a 18.368(5) Å, b 18.591(7) Å, c 6.594(4) Å, V 2251(1) ų and its average composition Na₂O 14.54, Al₂O₃ 26.98, SiO₂ 45.24, K₂O 0.04, CaO 1.46, H₂O_calc. 9.23, total 97.48 wt. % corresponding to formula (Na_1.83Ca_0.10)_Σ1.93(Al_2.07 Si_2.94)_∑5.01O₁₀ . 2H₂O on the basis 10 O.

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