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35 Cards in this Set
- Front
- Back
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List the three rock families:
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Igneous
Sedamentary Metamorphic |
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A rock is?
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A naturally occuring assemblance of minerals.
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How can an Igneous rock form?
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Cooling of magma/lava
pyroclastic debris |
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The minerals of a fine-grained crystalline granular rock are------ to the eye.
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Naked
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Magmas and lavas are produced by processes associated with:
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Sea floor spreading
Plate techtonics |
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What two properties are used to identify any rock?
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Texture
Composition |
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Identify the following rocks...
Texture: course-grained crystalline granular |
Mineralogy: plagioclase with abundant ferromagnesians
Rock color: dark Rock name: Gabbro |
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Texture: fine-grained crystalline granular
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Mineralogy: non ferromagnesians(quartz and feldspar) very abundant, monor amounts of ferromagnesian minerals
Color: Light Rock name: Rhyolite |
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Texture: fine-grained crystalline granular
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Mineralogy: abundant ferromagnesians with some plagioclase
Color: dark Rock Name: Basalt |
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Texture: glassy, frothy
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Rock color red: scoria
Rock color grey: pumis |
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Texture: fine-grained pyroclastic
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Rock Name: tuff
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The minerals in a pegmatite are very------ & ------- in their grain size.
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Large and coarse
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Is granit a fine-grained or coarse-grained crystalline granular rock?
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Coarse grained
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How does a glassy texture form?
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Forms when a lava cools very rapidely, minerals do not have time to crystallize and the rick is amorphous i.e. natural glass
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How does granit differ from basalt?
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Granit: coarse,light
Basalt: fine, dark |
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Is the mineralogy of a granite about the same as that of a rhyolite?
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Yes, identical
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Where do plutonic or intrusive rocks form?
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At great depth
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Where do extrusive rocks form?
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At the earths surface
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Very large minerals and many gem minerals are found in:
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Pegmatites
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Most rocks that occur of the surface of the earth belong to which rock family?
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Sedamentary
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How does a coarse-grained crystalline granular texture form?
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Very slow cooling @ depth
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Name two types of glassy textures:
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Massive- obsidian, big chunks of glass
Frothy- pumis |
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The following rocks have what kind of texture?
Granit |
Coarse grained
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Scoria:
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Glassy
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Tuff:
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Pyroclastic
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Rhyolite:
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Fine-grained crystalline granular
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What is volcanic ash?
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Tuff, fragments in 1/4" of diameter. Fine pyroclasts
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What type of texture would be found in rocks produced by a violent volcanic eruption?
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Ash(tuff) coarse ash(tuff breccia)blocks(breccia)
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What is the difference between a rock and a mineral?
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Minerals make up rocks
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Name two igneous rocks that have a coarse-grained crystalline granular texture:
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Gabbro
Granit |
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Name two igneous rocks that have fine-grained crystalline granular texture:
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Rhyolite
Basalt |
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Name three igneous rocks that have a glassy texture:
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scoria(red)
frothy Pumis(grey) Obsidian(glassy) |
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Name three pyroclastic igneous rocks:
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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 |
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What textur forms when a magma sools slowly @ depth?
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Coarse grained, crystalline granular
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What crystalline rock occure in Hawaii
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Bassalt
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