Description: Alamdine, Fe3Al2Si3O12, is the most common type of garnet and is typical of medium to high grade metamorphic rocks. Garnet typically forms crystals with 12 identical, or 24 identical faces. This crystal contains both forms and two different shaped faces can be seen. The garnet shown is about 4 cm across; most garnets are not this large.
Geologic province: Adirondacks (Grenville).
Location: USA ▹ New York. Tupper Lake in the Adirondack Mountains.
Collection: University of North Dakota Mineralogy Collection.
Tech details: 413 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
The Geoscience Digital Image Library (GeoDIL) is a collection of Earth science images primarily intended as a teaching and learning resource for K-16 educators and students. This project was initiated at the University of North Dakota (UND) in fall 2000. Dexter Perkins and Joseph Hartman, of UND's Department of Geology and Geological Engineering, are the Library Directors.