Mystery Minerals Use the key to figure out the mystery minerals
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?
Show me the answer Graphite
Mineral #2 Color: greenish Luster: Nonmetallic Streak: colorless No reaction to acid Is it….calcite, olivine, hornblende or feldspar?
Show me the answer Olivine
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?
Show Me the Answer Talc
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?
Show me the answer Calcite
Mineral #5 Color: peachy Luster: nonmetallic, translucent Streak: white Hardness: 6 No reaction to acid Is it….feldspar, quartz, calcite, or diamond?
Show me the answer »Feldspar