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Proceed To Checkout: While the background (matrix) is fine-grained, aphanites frequently contain occasional large crystals called phenocrysts embedded within them.
: When lava reaches the Earth's surface or shallow subsurface (hypabyssal environments), it cools too quickly for large crystals to grow. aphanite
Aphanites are typically (volcanic) rocks. Their signature microscopic structure is the result of rapid cooling: : While the background (matrix) is fine-grained, aphanites
: While the background (matrix) is fine-grained, aphanites frequently contain occasional large crystals called phenocrysts embedded within them.
: When lava reaches the Earth's surface or shallow subsurface (hypabyssal environments), it cools too quickly for large crystals to grow.
Aphanites are typically (volcanic) rocks. Their signature microscopic structure is the result of rapid cooling: