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Author Question: Why do pegmatite mineral crystals grow so large? What will be an ideal ... (Read 44 times)

daltonest1984

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on: Jul 15, 2018
Why do pegmatite mineral crystals grow so large? What will be an ideal response?

Question 2

List three processes by which felsic and intermediate igneous rocks can be formed from more mafic
  magmas. What will be an ideal response?



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rachel

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

The water-rich magma inhibits the formation of nuclei, but allows ions to move easily to those nuclei
that do form, so large crystals can result.



Answer to Question 2

Possibilities include assimilation, magma mixing, crystal settling, and partial melting.


daltonest1984

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Reply 2 on: Jul 15, 2018
Excellent

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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