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35 Cards in this Set

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List the three rock families:
Igneous

Sedamentary

Metamorphic
A rock is?
A naturally occuring assemblance of minerals.
How can an Igneous rock form?
Cooling of magma/lava

pyroclastic debris
The minerals of a fine-grained crystalline granular rock are------ to the eye.
Naked
Magmas and lavas are produced by processes associated with:
Sea floor spreading

Plate techtonics
What two properties are used to identify any rock?
Texture

Composition
Identify the following rocks...

Texture: course-grained crystalline granular
Mineralogy: plagioclase with abundant ferromagnesians

Rock color: dark

Rock name: Gabbro
Texture: fine-grained crystalline granular
Mineralogy: non ferromagnesians(quartz and feldspar) very abundant, monor amounts of ferromagnesian minerals

Color: Light

Rock name: Rhyolite
Texture: fine-grained crystalline granular
Mineralogy: abundant ferromagnesians with some plagioclase

Color: dark

Rock Name: Basalt
Texture: glassy, frothy
Rock color red: scoria

Rock color grey: pumis
Texture: fine-grained pyroclastic
Rock Name: tuff
The minerals in a pegmatite are very------ & ------- in their grain size.
Large and coarse
Is granit a fine-grained or coarse-grained crystalline granular rock?
Coarse grained
How does a glassy texture form?
Forms when a lava cools very rapidely, minerals do not have time to crystallize and the rick is amorphous i.e. natural glass
How does granit differ from basalt?
Granit: coarse,light


Basalt: fine, dark
Is the mineralogy of a granite about the same as that of a rhyolite?
Yes, identical
Where do plutonic or intrusive rocks form?
At great depth
Where do extrusive rocks form?
At the earths surface
Very large minerals and many gem minerals are found in:
Pegmatites
Most rocks that occur of the surface of the earth belong to which rock family?
Sedamentary
How does a coarse-grained crystalline granular texture form?
Very slow cooling @ depth
Name two types of glassy textures:
Massive- obsidian, big chunks of glass

Frothy- pumis
The following rocks have what kind of texture?

Granit
Coarse grained
Scoria:
Glassy
Tuff:
Pyroclastic
Rhyolite:
Fine-grained crystalline granular
What is volcanic ash?
Tuff, fragments in 1/4" of diameter. Fine pyroclasts
What type of texture would be found in rocks produced by a violent volcanic eruption?
Ash(tuff) coarse ash(tuff breccia)blocks(breccia)
What is the difference between a rock and a mineral?
Minerals make up rocks
Name two igneous rocks that have a coarse-grained crystalline granular texture:
Gabbro

Granit
Name two igneous rocks that have fine-grained crystalline granular texture:
Rhyolite

Basalt
Name three igneous rocks that have a glassy texture:
scoria(red)
frothy
Pumis(grey)

Obsidian(glassy)
Name three pyroclastic igneous rocks:
Tuff(ash) fragments less than 1/4" in diameter

Tuff breccia(coarse ash) fragments less than 2" in diameter.

Breccia(blocks) fragments 1/4" to 2" in diameter
What textur forms when a magma sools slowly @ depth?
Coarse grained, crystalline granular
What crystalline rock occure in Hawaii
Bassalt