Quartzite

//ˈk(w)ɔːtˌsaɪt// noun

Definitions

Noun
  1. 1
    A metamorphic rock from sandstone, consisting of interlocking grains of quartz. countable, uncountable

    "Following the course of the river from New Ulm to Fort Ridgely, there are several exposures of reddish-brown “granite” or quartzites, which has been quarried in a few places, but I do not feel entirely sure of its connection with the rocks in the prairie or at the Ferry below."

  2. 2
    hard metamorphic rock consisting essentially of interlocking quartz crystals wordnet

Etymology

From quartz + -ite.

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