A Geoscience Digital Image Library

TitlePhyllite, Mariposa County, California
DescriptionThis is a very fine grained metamorphic rock. It is termed a phyllite because it is foliated and has a shiny/silky sheen to its surface. Even in thin section, the only major mineral that can be identified is quartz, but the shiny appearance suggests the presence of fine grained micas. This sample is 9.5 cm across.
LocationUSA ▹ California ▹ Mariposa. Near Mariposa.
PhotographerMike Davis. 2001-04-26.
CollectionWard’s University Rock Collection #185.
Key wordsphyllite, California
Tech details554 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens.
GeoDIL number423