Metamorphic Rocks- Transformation of one rock type into another.

Metamorphism takes place when preexisting rock is subjected to a physical or chemical environment that is significantly different from that in which it was formed.

Metamorphism occurs due to the:

“Metamorphic Agents” ->1.Heat 2.Pressure 3.Chemically Active Fluid

Every metamorphic rock has a parent rock, the rock from which it was formed, because metamorphic rocks are produced from preexisting igneous, sedimentary or other metamorphic rocks.

Foliated Metamorphic Rocks –

“Layers” form from directed stress, where pressure is greater in one direction than any others.

Slate

slate flat top(slaty cleavage) with side foliationSlate side foliationred slatered slate side foliation

Phyllite

Phyllite luster and mini-undulationsPhyllite side foliation

Schist

Garnet Schist2Garnet Schist

Gneiss

GneissGneiss3Gneiss pinkGneiss pink side foliation

Nonfoliated Metamorphic Rocks-

Formed from lithostatic stress (confining pressure), where the pressure is equal from all directions.

Marble

Marble2Marble

Quartzite

QuartziteQuartzite2

Anthracite Coal

Anthracite CoalAnthracite Coal3

Greenstone

Greenstone2Greenstone