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GLG 103 LAB 3 Igneous Rocks
PVCC
12
Geology
Undergraduate 1
02/27/2010

Additional Geology Flashcards

 


 

Cards

Term
[image]
Definition

Obsidian

Extrusive Igneous Rock

 

Texture: Glassy

Color: Intermediate between light (felsic) and dark

         (mafic) (blackish/brownish in color)

Term
[image]
Definition

Dunite

Intrusive Igneous Rock

 

Texture: Phaneric

Minerals: Olivine with mica crystals intermittent 

Color: Ultramafice (green crystalline)

Term
[image]
Definition

Pumice

Extrusive Igneous Rock

 

Texture: Vesicular

Minerals: Felsic 

Color: Felsic (white with a few grayish flecks)

Term
[image]
Definition

Rhyolite

Extrusive Igneous Rock

 

Texture: Aphanitic

Minerals: Felsic

Color: Felsic (grayish with a few dark crystals)

Term
[image]
Definition

Basalt

Extrusive Igneous Rock

 

Texture: Aphanitic

Minerals: unknown

Color: Mafic (no grains visible, very dark/black)

Term
[image]
Definition

Scoria

Extrusive Igneous Rock

 

Texture: Vesicular

Minerals: unknown

Color: Mafic (black with 'rust', red/brown oxidation)

Term
[image]
Definition

Granite

Intrusive Igneous Rock

 

Texture: Phaneric

Minerals: Felsic

Color: Felsic (orange and white crystals)

 

Remember: Granite - Granodiorite - Diorite

                  Light   -  light/dark    - dark w/some light

Term
[image]
Definition

Tuff

Extrusive Igneous Rock

 

Texture: Fragmental

Minerals: Felsic

Color: Felsic (buff colored with flecks of brown lightly

         sprinkled in)

Term
[image]
Definition

Andesite Porphyry

Intrusive Igneous Rock

 

Texture: Porphoritic

Minerals: unknown

Color: Intermediate between Felsic and Mafic (black

         andesitic groundmass; medium sized columnar

           black glass like crystals)

Term
[image]
Definition

Gabbro

Intrusive Igneous Rock

 

Texture: Phaneric

Minerals: unknown

Color: Mafic (dark with white crystals - less than 50%)

Term
[image]
Definition

Granodiorite

Intrusive Igneous Rock

 

Texture: Phaneric

Minerals: Felsic

Color: Felsic (fewer dark than light crystals)

 

Remember: Granite - Granodiorite - Diorite

                  Light   -   light/dark   -  dark w/some light

Term
[image]
Definition

Diorite

Intrusive Igneous Rock

 

Texture: Phaneric

Minerals: unknown

Color: Intermediate between Felsic and Mafic (more

         dark than light crystals)

 

Remember: Granite - Granodiorite - Diorite

                  Light   -  light/dark    - dark w/some light

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