1. Rock Classification Composition and texture
Rocks are divided into three main classes based on how they form:
Igneous
Sedimentary
Metamorphic
Each type of rock can be further classified based on:
Composition and texture

2. Composition The chemical make up of the rock or what it is made of.
This can be minerals or other materials: shells, clay, plants, sand, pebbles

3. Texture/Grains Determined by the grains size, shape and position.
Igneous can be fine or coarse grain
Sedimentary can be characterized by observing lithified (cemented) inorganic grains, minerals, organic material, or fossil fragments. The wide range of textures common in sedimentary rocks is separated into clastic, chemical, and bioclastic (biochemical) groups.

4. Texture/Grains
Metamorphic textures consist of two main types: foliated and non-foliated textures.
Texture can reveal the process that formed the rock.

5. Igneous Rocks

6. What are they? LAVA, above ground or MAGMA, below ground.
Rock made from cooled
LAVA, above ground or
MAGMA, below ground.

7. Texture – Grain/ minerals Origin - where formed
Classification
They are classified
in 3 ways:
Texture – Grain/ minerals
Origin - where formed
Mineral Composition – made from

8. Grain Size Have….
SPECIAL NAMES

9. Texture/Grain Coarse Grained = large grains, cooled slowly
Think about it…. If it cools over a long time – the grains have time to get big! 
Most abundant intrusive rock is GRANITE
Fine Grained = small grains, cooled fast
Think about it… If it cools over a short time – the grains don’t have time to get big!
Example: Basalt

10. Igneous Rock Formation-Origin
Extrusive – formed ABOVE GROUND. It cools fast so it has small grains.
Intrusive – formed UNDERGROUND. It cools slowly so it will have large grains.
Laccolith

11. Basalt = Extrusive Igneous rock
Examples of each type of ROCK Fine Grained
Basalt = Extrusive Igneous rock
Course Grained
Granite = Intrusive Igneous rock

12. Mineral Composition Low silica content = dark colored = Mafic
How much silica is in the magma/lava?
Low silica content = dark colored = Mafic
High silica content = light colored = Felsic
High Silica Content Low Silica Content
Felsic Igneous Rock Mafic Igneous Rock

13. Draw pictures of the different types of Igneous Rocks!
Small or No Crystals
Big Crystals
Lighter
Darker

14. Label the igneous rock formation

15. Ticket out: CHOOSE ONLY ONE
What makes up the grains in an igneous rock?
Illustrate grains of an igneous rock and explain why this happens
Compare and contrast intrusive and extrusive igneous rocks