A Geoscience Digital Image Library

TitleAndalusite (chiastolite) slate, Mariposa County, California
DescriptionThis fine grained slate contains chiastolite (andalusite) crystals up to 0.5 cm in diameter, but they are very hard to see because they have been altered and have about the same color as the rest of the rock. The sample is 10 cm across.
ChronostratigraphyUpper Jurassic
LocationUSA ▹ California ▹ Mariposa
PhotographerMike Davis. 2001-04-10.
CollectionWard’s Collection of Classic North American Rocks #84.
Key wordsandalusite slate, chiastolite, California
Tech details447 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number335