Quartzite is a rock that can be form at boundaries of tectonic plates. Over time sandstone buried at the boundary is folded and changed by pressure and heat. The sandstone becomes quartzite. Quartzite is most likely an Rock.

metamorphic rock

Explanation:

Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. It forms when a quartz-rich sandstone is altered by the heat, pressure, and chemical activity of metamorphism. These conditions recrystallize the sand grains and the silica cement that binds them together.

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answerspecific gravity;