Use groups earth materials by what people actually do with them. Wikipedia notes that "since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings," a use that has nothing to do with the mineral's scientific classification. This dimension connects a material to its place in human hands rather than only in the ground.
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Formation OriginArise from the transformation of existing rock into new rock types through metamorphism. 1 Industrial and Abrasive
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1. Wikipedia: Metamorphic rock
WikipediaMetamorphic rock, lead sectionQuote, Metamorphic rock, lead section
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism.
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