Possible Clues:

• Male into strange rock
• Disheartened drunk chasing last of the hard stuff
• Material at your fingertips?
• Pedicurist's board
• An abrasive comedian
• Abrasive gallery remembers revolutionary exhibits
• Coarse rock some may remember on reflection
• Filing need
• ... coarse stuff from Dick?
• Mere polluted with yttrium, a hard mineral