Kaatialaite, a new ferric arsenate mineral from Finland

Kaatialaite, a new ferric arsenate mineral from Finland

Kaatialaite, with a formula close to FeAs3O9.6H2O 154(or Fe(H2AsO4)3.3H2O), occurs naturally admixed with arsenolite and other minor phases as a pale grey to yellow powdery weathering product on lollingite from the granite pegmatite at Kaatiala, Kuortane, W Finland. The X-ray powder pattern is ident...

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Bibliographische Detailangaben
Veröffentlicht in:The American mineralogist 1984-04, Vol.69 (3-4), p.383-387
Hauptverfasser: Raade, Gunnar, Mladeck, Micael H, Kristiansen, Roy, Din, Victor K
Format: Artikel
Sprache:eng
Schlagworte:
arsenates
arsenides
cell dimensions
Europe
Finland
Kaatiala granite pegmatite
kaatialaite
Kuortane
lollingite
mineralogy
minerals
new minerals
nonsilicates
optical properties
physical properties
Scandinavia
Western Europe
western Finland
X-ray data
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Beschreibung
Zusammenfassung:Kaatialaite, with a formula close to FeAs3O9.6H2O 154(or Fe(H2AsO4)3.3H2O), occurs naturally admixed with arsenolite and other minor phases as a pale grey to yellow powdery weathering product on lollingite from the granite pegmatite at Kaatiala, Kuortane, W Finland. The X-ray powder pattern is identical with that of synthetic FeAs3O9.8H2O 154(or Fe(H2AsO4)3.5H2O). Additional properties of the synthetic phase have been determined. It is monoclinic P21 or P21/m, a 15.363(5), b 19.844(5), c 4.736(2) A, beta 91.77(3)o, Z=4. Optically biaxial positive, the synthetic phase has refractive indices alpha 1.581, beta (calc) 1.582, gamma 1.625. The strongest XRD lines for the synthetic material are 8.33(100), 7.68(70), 9.94(50), 6.08(40), 3.153(45) 3.410(40) A; , for the natural mineral the corresponding data are 8.35(vs), 7.72(s), 9.91(s), 3.159(m), 6.09(m), 3.408(m) A.
ISSN:0003-004X
1945-3027