Clue: Grayish mineral

Answer: URAO

Length: 4

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Similar Clues:

• Grayish-white mineral (TRONA with 5 letters)
• Useful mineral (e.g. ORE with 3 letters)
• Manicurist's mineral (EMERY with 5 letters)
• Easily scratched minerals (TALCS with 5 letters)
• Soft, blue-gray mineral (GALENA with 6 letters)
• Supersoft mineral (TALC with 4 letters)
• Lustrous mineral (e.g. BERYL with 5 letters)
• Mined minerals (ORES with 4 letters)
• Mineral scale eponym (MOHS with 4 letters)
• Mineralogist's sample set (ORES with 4 letters)