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 OriginFormed through the cooling and solidification of magma or lava. 1 Hardness
Connections
Sources
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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