Texture: Medium-grained; usually of a granoblastic texture.
Structure: Usually massive but primary sedimentary features may be preserved, such as bedding, graded bedding or current bedding.
Mineralogy: Essentially composed of tightly interlocking grains of quartz. A little feldspar or mica may also be evident. White varieties are distinguished from marble by their greater hardness.
Field relations: Quartzites are metamorphosed quartz sandstones and are found in association with other metamorphosed sedimentary rocks such as phyllite, schist and marble." (Hamilton et al 1976, 188)
quartzite flakes