Quartzite
A sedimentary sandstone which by metamorphic action has been converted into a hard rock possessing a highly refractory nature, for which reason it was formerly employed for constructing blast-furnace hearths, etc. See SAND-STONE.
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A sedimentary sandstone which by metamorphic action has been converted into a hard rock possessing a highly refractory nature, for which reason it was formerly employed for constructing blast-furnace hearths, etc. See SAND-STONE.