quartzite
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Quartzite. Image credit: Mineral
Information Institute |
A hard, massive metamorphic rock resulting
from sandstone in which the quartz
grains have recrystallized. It is typically colored white, light gray, or
yellow, but it also comes in green, blue, purple, and black varieties that
contain other minerals. Tough and resistant to weathering it is used in
road metal. Related category
GEOLOGY
AND PLANETARY SCIENCE
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