posted by Unknown .
Fill in the blanks:
1. Minerals are classified in many ways, including hardness, streak, and _______ properties.
2. There are some minerals that are valued as _______ because of their hardness, color, and beauty.
3. Non-silicates make up less than 10% of Earth's _______; the most common non-silicates are the carbonate, oxides, and sulfides.
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