Metamorphic Rocks: Marble and Quartzite

This video explores two non-foliated metamorphic rocks: marble and quartzite. It explains how these rocks undergo high-temperature metamorphism without significant pressure, allowing crystals to regrow. Marble, derived from limestone, and quartzite, from sandstone, exhibit various colors and patterns due to their mineral compositions. The video highlights the unique crystal structures of these rocks, emphasizing their differences from igneous rocks.

What distinguishes non-foliated metamorphic rocks like marble and quartzite from their foliated counterparts?

• They have a layered appearance.

• They are formed from magma.

• They undergo high temperature metamorphism.

• They experience high pressure.

How do the crystals in marble and quartzite grow during metamorphism?

• They form perfect geometric shapes.

• They grow large but blobby due to limited space.

• They remain small due to high pressure.

• They grow into their natural crystal habits.

What is marble primarily formed from?

• Sandstone

• Basalt

• Granite

• Limestone

Which factor contributes to the variety of colors in marble?

• The type of sandstone it forms from.

• The presence of quartz crystals.

• The different species of calcite.

• The amount of pressure during formation.

Quartzite is primarily formed from which type of rock?

• Limestone

• Basalt

• Sandstone

• Granite

What is a key property of quartzite that it shares with quartz?

• It forms perfect tetrahedral shapes.

• It is soft and easily scratched.

• It has a layered structure.

• It is as hard as quartz.

Why don't the crystals in quartzite show their natural tetrahedral shapes?

• They are perfectly aligned.

• They are dissolved during formation.

• They are restricted by limited space.

• They are too small to form shapes.

What is a common misconception about the formation of marble and quartzite?

• They are formed from magma.

• They are foliated rocks.

• They are sedimentary rocks.

• They are formed under high pressure.

Which of the following is NOT a characteristic of quartzite?

• It comes in various colors.

• It is formed from limestone.

• It has a blobby crystal structure.

• It is as hard as quartz.

What is the main reason for the blobby appearance of crystals in marble and quartzite?

• High pressure during formation.

• Complete melting into magma.

• Limited space for crystal growth.

• Presence of water during formation.