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 OriginFormed through the cooling and solidification of magma or lava. 1 5.5
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1. Wikipedia: Igneous rock
WikipediaIgneous rock, lead sectionQuote, Igneous rock, lead section
Igneous rocks are formed through the cooling and solidification of magma or lava.
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