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rocks and volcanoes
rocks and volcanoes
22
Science
Undergraduate 2
09/21/2014

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Cards

Term
Granite
Definition

granite

 

Intrusive

Color index- Felsic

Texture- phaneritic

Minerals- quartz, feldspars

 

Term
Basalt
Definition

Basalt

 

Extrusive

color index- Mafic

texture- Aphanitic

minerals- feldspars, pyroxene, olivine

 

Term
obsidian
Definition

obsidian

 

extrusive

color index- Felsic-intermediate-mafic

texture- glassy

minerals- quartz (pure SiO2)

Term
pumice
Definition

Pumice

 

Extrusive

color index- felsic-intermediate

texture- galssy

minerals- quartz, feldspars, amphibale

Term
Scoria
Definition

Scoria

 

Extrusive

color index- Mafic

texture- vesicular

minerals- feldspars, olivine, pyroxene, amphibole

Term
Andesite
Definition

Andesite

 

Extrusive

color index- intermediate

texture- aphanitic fine grained

minerals- feldspar, pyroxene, amphibole

Term
peridotite
Definition

peridotite

 

intrusive

color index- ultramafic

texture- phaneritic coarse grained

minerals- olivine, pyroxene

Term
Diorite
Definition

Diorite

 

Intrusive

color index- intermeniate

texture- phaneritic coarse grained

minerals- feldspars, pyroxene, amphibole

Term
Gabbro
Definition

Gabbro

 

Intrusive

color index- mafic

texture- phaneritic coarse grained

minerals- feldspar, olivine, pyroxene, amphibole

Term
Rhyolite
Definition

Rhyolite

 

Extrusive

color index- felsic

texture- aphanitic fine grained

minerals- K-spar, quartz, muscovite

Term
Pegmatitic granite
Definition

Pegmatitic granite

 

Intrusive

color index- felsic

texture- pegmatitic very coarse grained

minerals- k-spar, quartz, muscovite

Term
Intrusive rocks
Definition

-rocks that cool very slowley beneath the earth

-crystals are large in size, greater than 1mm

Term
Phaneritic
Definition
crystals that are visible to the naked eye (1mm-1cm)
Term
Pegmatititc
Definition
Extremely large crystals (>1cm)
Term
Extrusive rocks
Definition

- Cool rapidly at the surface of the earth

- very tiny crystals, not enough time for them to develope

Term
Aphanitic
Definition
Very small or not visible crystals (<1mm)
Term
Glassy
Definition
Solid glassy mass
Term
vesicualr
Definition
rock containes air bubbles
Term
Porphyritic rock
Definition
containes large and small cyrystals
Term
shield volcano
Definition
Very large, gentley sloping broad volcano with large crater opening. Low viscosity. (ex. Hawaii)
Term
cinder cone volcano
Definition
small, steep-sloping, cone-shaped with wide crater opening. small explosive eruptions.
Term
Composite volcano
Definition
steep sloping, cone shaped, with small crater opening. medium to high viscosity, lots of trapped gasses. large explosive eruptions.
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