A Geoscience Digital Image Library

TitleSkarn (tactite), San Bernardino County, California
DescriptionWard’s Natural Science Establishment calls this a “tactite skarn” which is a redundant name. Both terms, as used today, refer to a carbonate-rich rock that has been metamorphosed and metasomatized (compositionally changed) by contact metamorphism. Skarns are marbles that often contain significant amounts of Ca and Ca-Mg silicates. They vary in scale and size. Some have dimensions measured in meters or less, some are 100's of km3. San Bernardino County contains many famous skarns, many of which have been quarried. It is unknown exactly where this sample comes from. This hand sample is 9 cm in longest dimension.
LocationUSA ▹ California ▹ San Bernardino
PhotographerNessa Eull. 2001-05-22.
CollectionWard’s University Rock Collection #178.
Key wordstactite, skarn, California, calc-silicate
Tech details602 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number511