The Mineral Identification Key Copper, Michigan, Seaman Museum specimen

Section III: Minerals with a Non-Metallic Luster & Hardness Greater than 5½

Step 12 Can the mineral be scratched by a sharp quartz point? (Hardness less than 7?)
Yes - [Go to Nonmetallic Luster Key (Hard): Step 13]
No - [Go to Nonmetallic Luster Key (Hard): Step 14]

Step 10     Hardness

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