Minerals. Minerals vs. Rocks. Rock – an aggregate of minerals (mixture of minerals). Mineral – naturally occurring, inorganic, crystalline solids, with a definite chemical composition. All minerals are rocks, but not all rocks are minerals!. Granite (rock). mixture of:. Quartz
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All minerals are rocks, but not all rocks are minerals!
1. Crystal Form
Choosing the Luster:
Shiny like a metal?
What kind of nonmetallic?
How to test a mineral’s hardness
Start by moving an unknown sample across a sample with a hardness of 1.
2. If the unknown scratches the known sample, then it is harder….so keep testing the others until it doesn’t scratch it.
3. If it doesn’t scratch it, then it is softer than the known sample so it is lower on the scale.
4. If they scratch each other, they are the same hardness.
8. Specific Gravity
9. Other Properties