Sharpen your mineral and rock ID skills with geology professor Shawn Willsey by learning one of the most common minerals around, feldspar. Here we delve into the common traits and characteristics of both plagioclase and potassium feldspar and then look at these minerals in a variety of rocks.

Link to PDF of document I used: https://drive.google.com/drive/folder...

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Shawn Willsey
College of Southern Idaho
315 Falls Avenue
Twin Falls, ID 83303