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A fine-grained, light-colored igneous rock, composed chiefly of feldspar and quartz.

fel·sit′ic (-sĭt′ĭk) adj.
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The Sarzedas-Pomar region could be a good example of effective above-noted elements contribution in gold deposits secondary haloes hosted by Schist Greywacke Complex in the CIZ, where W, Sb and As anomalies in soils are close and related to W-Au-Sb quartz veins, Sb-Au-bearing felsitic dykes and mine wastes.
Minor grain types include chalcedonic microcrystalline quartz of indeterminate origin but possibly from amygdules in volcanic rock, polycrystalline microlitic and felsitic volcanic rock fragments (in addition to more abundant glassy volcanic rock fragments), equant opaque iron oxide grains that are probably magnetite, internally foliated fragments of metamorphic slate, and rare aggregate epidote grains.
The property is underlain by a northeast striking belt of basic intrusive and extrusive rocks intercalated with metasedimentary rocks and intruded by quartz feldspar porphyry and felsitic rocks.