geodil.jpg

A Geoscience Digital Image Library

92.jpg
TitleHornblende gabbro, San Diego County, California
DescriptionThis is a medium grained dark gray intrusive igneous rock composed primarily of plagioclase (labradorite) and hornblende. Minor augite, magnetite pyrite, and a few other accessories are also present. This specimen is 8.5 cm across.
ChronostratigraphyCretaceous
Geologic provinceSan Marcos Gabbro
LocationUSA ▹ California ▹ San Diego. Near Escondido.
PhotographerTwyla Baker. 2001-02-15.
CollectionWard’s Collection of Classic North American Rocks #28.
Key wordshornblende gabbro, hornblende, gabbro, California
Tech details1.06 MB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number92