How Do Minerals Form? In general, minerals can form in one of two ways: Crystallization of molten material Crystallization of materials dissolved in water.

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What is a mineral? How do minerals form?

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Presentation transcript:

How Do Minerals Form? In general, minerals can form in one of two ways: Crystallization of molten material Crystallization of materials dissolved in water to form solutions.

What is crystallization? Process by which atoms are arranged to form a material with a crystal structure.

What is magma? Magma is molten material from inside the Earth that hardens to form rock. Lava is magma that reaches the surface. Which one dries faster – magma or lava?

How do crystals form from molten material? When hot magma cools inside the Earth, or as lava hardens on the surface. They form crystals. Notice the crystals in this granite. Compare and contrast the two samples. Why the difference?

What determines the size of the crystals? Magma deep below = cools slowly = large crystals Magma closer to the surface = cools faster = medium crystals Lava = cools rapidly = small crystals Slow Fast

How do minerals form from solutions? When elements and compounds that are dissolved in water leave a solution, crystallization occurs. The Cave of Crystals in Mexico

How do minerals form from solutions? Minerals formed by evaporation ( Ex: Halite (salt) forms when ancient seas evaporate) Minerals from hot water solutions (Ex: Veins of silver)