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Start with the full category, then apply the exact boundary: The ten reference minerals, from hardness 1 to 10. Use a mineral, not a hardness number. You only need one qualifying answer. A longer name is not automatically rarer.
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Shortest accepted input at 65+ points
GypsumGypsum · 65 points · 6 characters
Gypsum defines Mohs hardness 2.
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Orthoclase95 points · Shortest accepted spelling: Orthoclase
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- Apply the complete question boundary: The ten reference minerals, from hardness 1 to 10. Use a mineral, not a hardness number.
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Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: National Park Service · Mohs hardness scale ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.