Rocks: Igneous Rocks

Major Types of Rocks ,[object Object],[object Object]

Major Types of Rocks ,[object Object],[object Object],[object Object],[object Object]

The Rock Cycle ,[object Object],[object Object],[object Object]

The Rock Cycle On page 67 in your books

In conclusion… ,[object Object],[object Object],[object Object],[object Object]

Igneous Rocks ,[object Object],Photo used with permission from Mike Jarvis, Naperville Central HS, Naperville, IL Igneous from the Latin meaning “Fire formed”, is a rock type that forms from the solidification of a molten mineral solution.

All igneous rocks have a random fabric of fused mineral grains.

Igneous Rocks ,[object Object],[object Object],[object Object],[object Object]

Intrusive: Large crystals ,[object Object],Which is which? How do you know?

Igneous Rocks ,[object Object],[object Object],[object Object],[object Object],[object Object]

Felsic: Light overall color ,[object Object],Which is which? How do you know?

Coarse Grained: Large crystals ,[object Object],Which is which? How do you know?

Volcanic Glass/Obsidian : may be felsic, but is usually mafic. Even when felsic it appears dark nonetheless because the small % of mafic minerals in the rock form a homogenous solution with the felsic minerals tinting the overall color to dark. Notice the conchoidal fracture. Glassy Texture:

Porphyritic Texture: ,[object Object]

Pumice : Fine grained, felsic, vesicular volcanic igneous rock. ,[object Object],Vesicular Texture :

Igneous Rocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basalt Mafic = Dark color Fine grained = Small crystals Extrusive = Small crystals = Formed on surface

Diorite Felsic = Light color Coarse grained = Large crystals Intrusive = Large crystals = Formed underground

Gabbro Mafic = Dark color Coarse grained = Large crystals Intrusive = Large crystals = formed underground

Pumice Felsic = Light color Fine grained = Small crystals Extrusive = Small crystals = Formed above ground

Scoria Mafic = Dark color Fine grained = Small crystals Extrusive = Small crystals = Formed above ground

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Rocks: Igneous Rocks

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