CO XT K\TS 
Introduction .. . 9 
Modes of occurrence of corundum _ . 11 
Corundum in peridotites.. ._ 11 
Corundum in biotite, contact on saxonite ... 19 
Corundum in enstatite . _ 20 
Corundum in serpentine . . 20 
Corundum in chlorite- schist 21 
Corundum in amphibolite . . ._ __. 21 
Corundum (emery) in amphibolite at Chester, Mass . 23 
Origin of the emery „_ 25 
Corundum in norite .__ 26 
Corundum in basic minette 28 
Corundum in andesite . ....... 29 
Corundum in syenite 30 
Corundum in amphibole-schist ; 31 
Corundum in gneiss. .. 33 
Corundum in mica-schist 34 
Corundum in limestone 36 
Corundum in cyanite 36 
Summary of corundum occurrences ._ 37 
Distribution of corundum 37 
Sapphire or corundum gems 38 
Oriental ruby . 39 
Oriental sapphires 46 
Xorth Carolina sapphires .. . 46 
Montana sapphires 47 
Rock Creek sapphires , 50 
Cottonwood Creek sapphires . . 51 
Yogo Gulch sapphires 52 
Etching figures 54 
Corundum . ."i."i 
North Carolina 55 
Macon County 55 
Sheffield mine 58 
Clay County 58 
Buck Creek or Cullakeenee mine 
Blue Ridge corundum tracts .... ... .. 59 
Jackson County ... . 61 
Georgia .... 63 
Laurel Creek mine . 63 
Track rock mine . . . 65 
Foster mine ... . . 65 
South Carolina ... . 66 
Pennsylvania . ... _ 66 
Montana. ...... 66 
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