Cochise College        Student Presentation

                          Geology Home Page

                          Roger Weller, geology instructor

                          wellerr@cochise.edu


Creating Thin Sections
by Jill Forsythe
 text     equipment     process     chart     samples     references

Samples of Thin Sections

 

Text Box: A difference can be seen between the thin section on the left and a polished section on the right.  

 

 

Text Box: Rock specimens and thin slices which correspond to them.  From top:  Gabbro, basalt, rhyolite, and scoria.

 


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Text Box: This is a picture of olivine.  The upper picture is plane polarized.   The lower picture is with cross polarization.

 

 

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   A cross-polarized thin section of rhyolite.
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 A plane-polarized thin section of rhyolite.
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  A plane-polarized thin section of biotite.

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  A cross-polarized thin section of biotite.

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 Euhedral crystals of garnet in a metamorphic rock.  This is a plane-polarized thin section.
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 Euhedral crystals of garnet in a metamorphic rock.  This is a cross-polarized thin section.
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 A thin section of plane-polarized gabbro.

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 A thin section of cross-polarized gabbro.

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 A thin section of plane-polarized sandstone.
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 A thin section of cross-polarized sandstone.

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