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Why can minerals that form early in fractional crystallization grow distinct crystal shapes?

zzz

wrote...

Posts: 98

Rep:

12 years ago

Why can minerals that form early in fractional crystallization grow distinct crystal shapes?

i can't seem 2 find this info in my text book =[
please help

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budsworth

wrote...

#1

12 years ago

The first crystals that form in fractional crystallization form at very high temperatures. This allows a lot more cooling time than crystals formed later. It is the cooling time that ultimately determines that shape of a crystal. ie: aphanitic, phaneritic, porphyritic...

The long cooling time thus allows the distinct crystal shape to form.

rkdgh2002

wrote...

#2

12 years ago

Because they are growing into a liquid that moves out of the way. The crystals form whatever faces that stabilise them by lowering interfacial energy.

When there are a lot of crystals, new growing crystals are not growing into space but are impinging on other crystals and so have to accommodate themselves to the space available.

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