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 OriginSulfide (S2-) or disulfide (S2-2) as the major anion. 1 6.5
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Sources
1. Wikipedia: Sulfide minerals
WikipediaSulfide minerals, lead sectionQuote, Sulfide minerals, lead section
The sulfide minerals are a class of minerals containing sulfide (S2-) or disulfide (S2-2) as the major anion.
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