This granite pegmatite illustrates the growth of extremely large crystals from a magma. It is composed of large feldspar (white) and biotite mica (silver-black) crystals in a groundmass of small crystals of quartz (gray), microcline, and albite (both white).
Provided by the Feldspar Corporations, Spruce Pine, North Carolina
Topic: Earth Science
Subtopic: Minerals and Resources
Keywords: Feldspar, Mica, Albite, Quartz, Mineralogy, Pegmatites