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 OriginA dominant halide anion (F-, Cl-, Br- or I-). 1 Hardness
Connections
Sources
1. Wikipedia: Halide minerals
WikipediaHalide minerals, lead sectionQuote, Halide minerals, lead section
Halide minerals are those minerals with a dominant halide anion (F-, Cl-, Br- and I-).
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