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This is what I read from another question, answered by ID0410848064:

When hot lava meets the cooler temperatures of the ocean, an instantaneous cooling reaction takes place within the hot lava causing the minerals to form and crystallize quickly, usually of a different chemical and molecular composition if it were allowed to cool gradually at the earth's surface. Also, the hot lava may take on saline water from the ocean, therefore altering the overall mineral composition.

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