Abstract
Pyrometamorphosed quartzofeldspathic rocks (sandstone, shale, claystone) and sediments (sand-silt, clay, glacial till, diatomaceous earth), and their metamorphosed equivalents (phyllite, schist, gneiss), are characterised by the presence of tridymite, mullite/sillimanite, cordierite, orthopyroxene, clinopyroxene, sanidine-anorthoclase, plagioclase (oligoclase–anorthite), corundum, hercynite-rich spinel, magnetite, ilmenite, hematite, pseudobrookite, sulphides and in carbonaceous protoliths, native metals. Ti-rich biotite and osumilite are less common; sapphirine is rare. These minerals are usually associated with acidic (rhyolitic) to intermediate (dacitic) glass that is frequently abundant enough for the rocks to be termed buchites and paralavas. Partly melted granite-granodiorite may contain tridymite, Ca-plagioclase, orthopyroxene and magnetite.
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Grapes, R. (2010). Quartzofeldspathic Rocks. In: Pyrometamorphism. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15588-8_3
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