Metamorphic Rock Cha-cha-changes Colossal marble statue of a lion which originally crowned a cliff top tomb. The eye sockets may have had insets of glass which reflected the light across the sea. Hellenistic period; late 4th to early 3rd century BC from Knidos, Asia Minor, now Turkey. (The British Museum)

How does metamorphic rock form? An already existing rock can change due to tremendous heat and/or pressure. This change is called metamorphism.

How does metamorphic rock form? Temperature Most metamorphism occurs at temperatures between 150 deg C to 1,000 deg C. Rocks don’t necessarily always melt at high temperatures because they still might be under high pressure.

How does metamorphic rock form? Pressure Layers of rock can push down and change a rock. Both pressure and heat can make a rock change its composition.

How does metamorphic rock form? FOLIATION If under enough pressure, the minerals in a rock can move slowly during metamorphism. Stripes (foliation) are made by certain minerals lining up. Examples include gneiss.

How does metamorphic rock form? Contact metamorphism Regional metamorphism

How does metamorphic rock form? Metamorphic structures include folds like these seen in Labrador, Canada.

What are metamorphic rocks made of? Certain minerals will change within a rock if under enough heat or pressure. garnet calcite quartz hematite

How do geologists classify metamorphic rock? Metamorphic rocks are rocks that have been changed in form due to heat, pressure, and chemical alteration. FOLIATED Slate Schist Gneiss NONFOLIATED Marble Quartzite

How do geologists classify metamorphic rock? Foliated Non foliated

Where did I come from??? Schist Gneiss Marble Quartzite Slate Comes from shale (sed.) Schist Comes from slate, which comes from shale!!! Gneiss Comes from Granite (ign.) Marble Comes from limestone (sed) Quartzite Sandstone changes into quartzite. and that stuff comes from QUARTZ… the hardest common mineral yea!!!

Discovery Channel Marble Mineral Marvel Stone How do you get marble???

That’s gneiss schist!!!

She thinks they are real rocks! Sucker!!! YES!!! She thinks they are real rocks! Sucker!!!

Name that Rock Type!!! READY??!! Igneous, Sedimentary, or Metamorphic? READY??!! is a link to Tim and Moby on Rock Types.

Intrusive or extrusive igneous

Sandstone or siltstone sedimentary

Deposition in layers sedimentary

Cemented together with mud sedimentary

Made by heat and pressure metamorphic

Obsidian, granite, and basalt Igneous

Foliated like gneiss Metamorphic

Clastic, organic, or chemical Sedimentary

Felsic or mafic magma Igneous

Minerals are chemically changed metamorphic

Marble, schist, or slate metamorphic

Made from lava or magma Igneous

Could have fossils sedimentary

Most common rock of all crust Igneous