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Author Question: In what two ways do minerals form from magma? What types of minerals dominate the minerals that ... (Read 166 times)

armygirl

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on: Jul 15, 2018

In what two ways do minerals form from magma? What types of minerals dominate the minerals that
  make up igneous rocks? What will be an ideal response?



Question 2

How are fracture and cleavage the same, and how are they different? What will be an ideal response?


hanadaa

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Reply #1 on: Jul 15, 2018
Answer to Question 1

As magma cools, minerals crystallize and grow. Basalts are dominated by ferromagnesian minerals
and granites by nonferromagnesian minerals. Hot water solutions derived from the magma invade
cracks in adjacent rocks and then crystallize.



Answer to Question 2

Not all minerals possess cleavage, but those that do can have cleavage of varying quality. Minerals can
possess more than one direction of cleavage. Cleavage is an important diagnostic property of minerals
because it reveals the underlying chemical structure of the mineral. Some minerals can be told apart
primarily by their different cleavage. Fracture occurs any time enough force is applied to a mineral and
it does not make a regular shape.



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armygirl

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Reply #2 on: Jul 15, 2018
Thank you


hanadaa

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Reply #3 on: Jul 15, 2018
No problemo


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