Siliceous
siliceous (adjective; in a mineralogical sense synonymous with acidic rock) – a rock predominantly composed of silica-based minerals (SiO2); usually lacking calcite minerals and therefore reacting negative with 10% HCl ("not bubbling"); sometimes, however, with traces of calcites or even with large amounts of calcites (e. g., a calcite-rich sandstone), and then reacting with HCl; examples of siliceous rocks include quartzite, sandstone, granite, rhyolite.
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