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.
Facts
Comparison
Formation OriginArise from the transformation of existing rock into new rock types through metamorphism. 1 Hardness
Connections
Sources
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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