Related Clues:

• It's found in banks
• Comstock output
• Band of gold?
• See 38-Across
• Bauxite or hematite
• Mesabi Range yield
• Change from a krone
• It may be lined with quartz
• It lacks refinement
• Sparkly rock
• See 5-Down
• Some can dig it
• Valuable rocks
• Hollow rock
• It's found in the ground