Related Clues:

• They could use some refinement
• They're in vein
• Groundbreaking discoveries?
• Rock groups?
• They're in veins
• Miner concerns
• Cobaltite and mispickel
• Assayers' samples
• Geologists' studies
• These can be found in pockets
• Valuable deposits
• They're found in veins
• Minerals in stores?
• They're found in streaks
• They're often unearthed