Hardness orders minerals by how well they resist scratching. Wikipedia notes that "quartz is the mineral defining the value of 7 on the Mohs scale of hardness," the reference scale geologists use to compare one mineral against another. Browsing by hardness groups minerals that scratch, or resist scratching, in the same way.
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Formation OriginArise from the transformation of existing rock into new rock types through metamorphism. 1 7
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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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