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Metamorphic Rocks

Minerals and Rockas Part 4

TermDefinition
Metamorphic rocks Parent rocks that have been altered by increases in temperature and pressure
Parent Rock Preexisting rock from which metamorphic rocks are formed
Heat Rock expands when heated causing the atoms to break apart and move more freely, as temperature decreases atoms join with other atoms to form different compounds, the result is a structural and chemical change
Pressure Under extreme pressure at great depths inside Earth, atoms bonds are broken and rearranged into denser and more compact structure
Texture The general appearance of the rock
Foliation When minerals rearrange in flat layers due to extreme pressure
Banding Type of foliation where pressure separates minerals into alternating light and dark layers (Examples: Gneiss)
Non-foliated When minerals rearrange and change form, but do not change shape
Grain Size Size of the individual grains in the rock
Composition The minerals that make up the rock
Regional Metamorphism Process in which metamorphic rocks are formed over large areas due to temperature and pressure increases
Contact Metamorphism Process in which preexisting rock changes when heat from magma or lava rearranges the minerals
Created by: cmbinder197
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