Metamorphic Rock Metamorphic rocks are formed by heat

Metamorphic Rock

Metamorphic rocks are formed by heat and pressure. They can be from changes in igneous, sedimentary, or other metamorphic rocks.

As the rocks are changed, their crystals become flattened. Minerals can change and become new minerals or the existing minerals can become larger.

Classification �Metamorphic rocks are classified by their texture �Foliated or nonfoliated �Coarse, medium, and fine grains

Foliated - mineral grains flatten and line up in parallel bands Nonfoliated No bands Mineral grains change, grow and rearrange

Review question 1 �Which statement best describes the difference between a rock and a mineral? �A. a rock is made of uniform material, while a mineral is made of many different materials. �B. a rock is very hard, while a mineral is much softer �C. A rock is made of different materials in no specific arrangement, while minerals have a definite composition and structure. �D. you can see through minerals, but not through rocks.

Review Question 2 What type of luster does this mineral have?

Review question 3 Cleavage or fracture?

Review question 4 Porphorytic or aphanetic?

Review question 5 What word describes the appearance of this rock? What are the holes from?

Review question 6 Intrusive or extrusive?

Review question 7 Porphoritic or aphanetic?