Akcesorický schreyerit ve vanadem bohatém grafitickém kvarcitu z Bítovánek (moldanubikum, západní Morava)

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Acta Mus. Moraviae, Sci. Geol. 96 (2011), vydání 2, stránky 35–42
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Accesory schreyerite in vanadium-rich graphite quartzite at Bítovánky (Moldanubicum, western Moravia)

A new occurrence of schreyerite was found in graphite quartzite near Bítovánky, in the south-eastern part of the Moldanubian zone (Bohemian Massif). It forms thin lamellae and grains intergrown with vanadium-rich rutile (0.044–0.058 apfu V) and isolated microscopic grains, in mineral assemblage quartz + graphite + vanadium muscovite + vanadium dravite. Schreyerite is poor in Cr and its chemical composition corresponds to the formula (V3+1.890–1.980Cr3+0.020–0.040Al3+0.020–0.040)2(Ti4+2.810–2.850 V4+0.140–0.190)3 O9. Schreyerite is locally altered to hydrated TiO2 with higher contents of Al (≤ 0.060 apfu) and Fe (< 0.028 apfu) compared to the original phase. Schreyerite predominately formed by exsolution from vanadium-rich rutile in the metamorphic post-peak conditions of the upper amphibolite facies.

Kontakt:

Stanislav Houzar*, Jan Cempírek, Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37 Brno, Czech Republic. *shouzar@mzm.cz

Citace
Houzar, S., Cempírek, , J., 2011: Akcesorický schreyerit ve vanadem bohatém grafitickém kvarcitu z Bítovánek (moldanubikum, západní Morava). – Acta Mus. Morav., Sci. Geol., 96, 2, 35–42 (with English summary)
ISSN: 1211–8796