Ultramafic Rocks
Texture & Porphyritic Texure
Igneous Rocks as Resources
Pegmatites
Kimberlites
100
Types of rocks that have low silica contents and high levels of iron and magnesium.
What are ultramafic rocks?
100
Slices of rock so thin that ____ can pass through them.
What is light?
100
Igneous rocks are very useful with making _____ materials?
What is building?
100
Veins with extremely large-grained minerals.
What are pegmatites?
100
______ is a mineral found in kimberlites.
What is diamond?
200
Two unusual igneous rocks.
What are peridotite and dunite?
200
As grains crystallize from magma, they grow together making _____.
What is interlocking edges?
200
Igneous rocks have this type of texture that gives them their strength.
What is interlocking?
200
Ores of ______ are found in pegmatites.
What are ores of rare elements?
200
The definition of kimberlites.
What is rare, ultramafic rocks?
300
The fractional crystallization of olivine and and pyroxene.
What is the first hypothesis of how ultramafic rocks are formed?
300
Large, well-formed crystals surrounded by finer-grained crystals of the same or different minerals.
What is pophyritic texture?
300
The most useful igneous rock.
What is granite?
300
Pegmatites can produce these.
What are beautiful minerals?
300
Where kimberlites might be formed.
What is deep in the Earth's crust or in the mantle?
400
Ultramafic rocks have high levels of iron and magnesium and low contents of ______.
What is silica?
400
These are a characteristic of many igneous rocks.
What are irregular crystal shapes?
400
One use of igneous rocks.
What is for the columns in the Rhodes Memorial in Cape Town, South Africa.
400
Veins can contain these.
What is other valuable resources?
400
Kimberlites form deep in the Earth's crust depths of ________ or in the mantle.
What is 150 to 300 km?
500
The second hypothesis on how ultramafic rocks are formed.
What is pieces of the upper mantle that have been brought close to Earth's surface?
500
Porphyritic texture indicates _____.
What is a complex cooling history wherein slowly cooling magma suddenly began cooling rapidly.
500
A use for granite.
What is for the kitchen tiles and the Vietnam Memorial in Washington, D.C.
500
Because veins fill cavities/fractures in rock, minerals grow into ____s and retain shape
What are voids?
500
Kimberlites were named after ______.
What is Kimberly, South Africa?
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