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South of Mesa Grande, Mesa Grande, Mesa Grande District, San Diego Co., California, USA

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Detailed Mineral List:

Sillimanite
Formula:	Al₂(SiO₄)O
Habit:	Acicular
Description:	Occurs as needles 1 to 2 cm in length in schists.
Reference:	Merriam, Richard Holmes (1946), Igneous and metamorphic rocks of the southwestern part of the Ramona quadrangle, San Diego County, California: Geological Society of America Bulletin: 57: 228; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 338; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 452.

1 entry listed. 1 valid mineral.

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Copyright © Jolyon Ralph and Ida Chau 1993-2011. Jobs in California, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 12th May 2011 02:38:45