Other
The image.com: Minerals
This is a very large list of minerals complete with image and physical descriptions, chemical descriptions, and classification.
James Madison University
James Madison U.: Bowen's Reaction Series & Igneous Rock Forming Minerals
If you're interested in learning about the igneous rock-forming minerals in seeing multiple pictures of each sample, then this is your site. It also includes the chain that these minerals follow. Click on the PDF link for a printable...
Other
Chemeketa Community College: Igneous Rock Identification
This resource contains detailed summaries of eight different igneous minerals. It also has enlarged pictures of the minerals as they appear embedded in igneous rock.
Amethyst Galleries
Amethyst Galleries: Mineral Gallery: Moonstone
This resource provides information on Moonstone, or Oligoclase.
Curated OER
The image.com: Minerals
This is a very large list of minerals complete with image and physical descriptions, chemical descriptions, and classification.