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Cause

Caused by links an earth material to the physical condition that produces its particular form. Wikipedia notes that quartz shifts between its two crystal forms because "the transformation from alpha-quartz to beta-quartz takes place abruptly at 573 degrees Celsius," heat alone deciding which form exists. This dimension groups materials that share the same underlying physical cause.

Facts
Comparison
Formation Origin
Arise from the transformation of existing rock into new rock types through metamorphism. 1
Cause
Connections

Classifies

Amphibolite, Materials
Blueschist, Materials
Eclogite, Materials
Gneiss, Materials
Greenschist, Materials
Hornfels, Materials
Marble, Materials
Migmatite, Materials
Mylonite, Materials
Quartzite, Materials
Schist, Materials
Skarn, Materials
Slate, Materials
Soapstone, Materials
Sources
1. Wikipedia: Metamorphic rock
WikipediaMetamorphic rock, lead section
Quote, Metamorphic rock, lead section
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism.
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