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



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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