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Sillimanite from
Southeast of Ramona, Ramona, Ramona Mining District, San Diego County, California, USA

Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Comments:Occurs in schists; to 2 cm in size. Abundant and widespread as needles in quartz-muscovite-sillimanite schist.
Confirmation
Validity:Believed Valid
References
References: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.
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Southeast of Ramona, Ramona, Ramona Mining District, San Diego County, California, USA
 
Mineral and/or Locality  
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