1. Mystery Minerals Use the key to figure out the mystery minerals

2. Mineral #1 Color: gray Luster: metallic; opaque Streak: black Hardness: can scratch it with a fingernail Not magnetic Is it…..magnetite, biotite, graphite, or quartz?

3. Show me the answer Graphite

4. Mineral #2 Color: greenish Luster: Nonmetallic Streak: colorless No reaction to acid Is it….calcite, olivine, hornblende or feldspar?

5. Show me the answer Olivine

6. Mineral #3 Color: grayish white Luster: non-metallic, translucent/opaque Streak: white Hardness: can easily scratch with a fingernail Is it….feldspar, sulfur, talc, or olivine?

7. Show Me the Answer Talc

8. Mineral #4 Color: yellowish white Luster: non-metallic, translucent Streak: white Hardness: can’t scratch with a fingernail, can scratch with a #7 mineral Reacts with acid Is it….halite, calcite, feldspar, or quartz?

9. Show me the answer Calcite

10. Mineral #5 Color: peachy Luster: nonmetallic, translucent Streak: white Hardness: 6 No reaction to acid Is it….feldspar, quartz, calcite, or diamond?

11. Show me the answer »Feldspar