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Lightning
Grade 5
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Minerals of Earth’s Crust

You can identify minerals by the luster or way the bounces off their surfaces. Shiny minerals have a(n) luster. Another way to tell minerals apart is by observing on a fresh surface. You tell gold from pyrite by using a streak . Hardness, or how well a mineral resists , is measured by Moh’s scale. The hardest mineral is a(n) . If a mineral has , it will break along flat surfaces. If it has , it wouldn’t break smoothly.