A Geoscience Digital Image Library

TitleStilpnomenlane schist, Laytonville Quarry, Mendocino County, California
DescriptionThis dark bronze-brown schist is from a quarry in the Franciscan Complex of California. Stilpnomelane is a relatively rare mineral, and some of the best samples come from the Franciscan, a subduction-zone-related complex that contains rocks and minerals formed by high pressure metamorphism. Besides the dominant brown stilpnomelane, this rock also contains quartz and garnet, although they are difficult to pick out. This sample is 8.5 cm across.
ChronostratigraphyJurassic and Cretaceous
Geologic provinceFranciscan
LocationUSA ▹ California ▹ Mendocino. Laytonville Quarry.
PhotographerNessa Eull. 2001-04-26.
CollectionWard’s University Rock Collection #81.
Key wordsstilpnomelane schist, schist, California
Tech details622 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens.
GeoDIL number409