Genth.] 4\J'-t [Sep. 19, 



corundum completely surrounded by margarite, and also by an earthy 

 mineral with veins of foliated margarite through it. The margarite in 

 contact with the grayish-white or pinkish corundum, is sometimes crypto- 

 crystalline, pseudofibrous, but generally in aggregates of small pearly- 

 white scales, of which I have made an analysis (M). In the yellowish 

 flesh colored mineral, the margarite is found in small veins consisting of 

 pearly greenish- white scales, much resembling talc. My analysis (k 2) 

 proved them to be margarite. 



I. A beautiful white variety of broadly laminated margarite completely 

 enveloping masses of cleavable corundum, has lately been discovered at 

 Dudleyville, Alabama. The lamina? are sometimes two inches broad. I 

 have analyzed it with the results given under I. This margarite appears 

 to change into a bronze-colored or brownish-yellow mineral, of which I 

 shall give a description below. 



The following are the results of the analyses : 



100.22 100.92 90.54 



100.68 99.94 100.31 100.21 



