Geology 370 - Elementary Petrology
University of Wisconsin-Madison
Spring 2000
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Geology 370

Quiz 1

Feb 1, 2000

  1. What is the general chemical formula for Olivine?
    2.

    (Mg,Fe)2SiO4

    What are the names of the Olivine endmember minerals?

    Forsterite (Mg) and Fayalite (Fe)

     

  2. What types of igneous rocks is olivine commonly found in?

Basalt, gabbro, dunite, peridotite etc

 

Are igneous rocks containing both olivine and quartz common? Explain.

No. Any melt that will crystallize quartz will have had time to react with Olivine to form Pyroxene.

 

3) What is the difference between porphyritic and brecciated textures?

 

Porphyritc texture has large crystals that grew in the rock

Brecciated texture is more like a sedimentary rock, a collection of fragments that have been fused together

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