Geology professor Shawn Willsey rounds out our survey and study of the silicate minerals by taking a close look at three common mafic (dark colored, rich in Mg and/or Fe) minerals: olivine, pyroxene, and amphibole. Link to PDF of document I used: https://drive.google.com/drive/folders/1bVvvWZaKxqdPEIk57oL9D14ceBEm6eHL?usp=sharing Support geology education via: PayPal: https://www.paypal.com/donate/?hosted_button_id=EWUSLG3GBS5W8 or Buy Me: https://buymeacoffee.com/shawnwillsey or Venmo: @shawn-willsey or click on the three dots below the viewer then "Thanks" or a good ol' fashioned check to: Shawn Willsey 148 Blue Lakes Blvd N #141 Twin Falls, ID 83301