Related Clues:

• Easily-split mineral
• Train for a match
• Layered silicate
• Exchange zingers
• Work out in the ring
• Flaky stuff
• Train to box
• Glittery rock
• Glass substitute
• Quarrel (with)
• Glinting flecks in granite
• Practice one's blows
• Practice jabs and hooks
• Engage in debate
• Exchange jabs