How is skeletal texture formed in metamorphic rocks?
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Answer:
Skeletal is a term used to describe the habit of euhedral to subhedral crystals in igneous rocks containing crystallographically orientated hollows and gaps. typically the voids within skeletal crystals are filled with groundmass materials.
In most minerals, the crystal has a higher concentration of the higher-temperature melting components (like Anorthite for plagioclase), so that the expelled lower-temperature melting components (like albite for plagioclase) concentrates at the interface.
Skeletal crystals form under large supercooling and indicate disequilibrium. They form by preferential growth of the corners of crystals, a diffusion controlled growth process. Skeletal morphologies are relatively common in olivine and plagioclase crystals in volcanic rocks. Skeletal olivine crystals are sometimes called hoppers. Dendrite and paralllel growth crystals are other crystal habits associated with large supercooling.
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