Introduction _ __ ___ 3 Previous studies ___.__ 3 Present investigation _ _ 4 Acknowledgments _________________________________________ 4 Regional geology ____________ 4 Geology of the deposits...___________________________________________________ 5 Deposits in quartzose rocks _________________ 7 Kyanite-quartz deposits. ._._ __ ____ _________________ 8 Petrography and chemistry_ __________________ 8 Sillimanite-quartz deposits _________________________________ 14 Andalusite-pyrophyllite-quartz deposits ______. 15 Deposits in micaceous schists and gneisses__-_________. 16 Kyanite schist and gneiss _____ ______________________ 16 Sillimanite schist and gneiss_________________ ______________ 17 Deposits in quartz veins and pegmatites-_.-_____-_ _____ 18 Residual deposits and placers. ______________________________ 18 Origin-__-__-__ _-________________________ ______.__________________. __________ 19 General considerations 19 Origin of Southeastern deposits ________________________ 22 Kyanite group minerals in micaceous schists and gneisses, quartz veins, and pegmatites 22 Kyanite group minerals in quartzose deposits 24 Metamorphosed high-alumina sedimentary rocks _ __ ______ 24 Replacement deposits _______________________________ 25 Relation of high-alumina quartzose deposits to volcanism. _ ___________________ 26 Origin of high-alumina quartzose deposits in other regions... ______________________________________ 27 Economic considerations _.._ ___ __________________________________ 29 Uses of kyanite, sillimanite, and andalusite____________ 29 History of mining.

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The rock is a tonalite (228) according to Johannoen (1932, p. 337)* The modifier indicates the high content of sodic oligoclase.