Thalite and Bozvlingite from Lake Superior. — WincJicll. 41 
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[Contributions to the Mineralogy of Minnesota. III.l 
THALITE AND BOWLINGITE FROM THE NORTH 
SHORE OF LAKE SUPERIOR. 
By N. H. WiNCHELL, Minneapolis, Minn. 
Thalite. During the survey of the Northwest (Wisconsin, 
Iowa and Minnesota) under the direction of Dr. D. D. Owen, 
a substance was found on the north shore of lake Superior at 
several points, which was exarnined by Owen and named tha- 
lite.* He found it to be a hydrated silicate of alumina and 
magnesia combined with what he considered a new earth "in- 
termediate between magnesia and manganese," with specific 
gravity 2.548, not found crystallized, and composed as fol- 
lows : 
Silica .^ 42.00 
Alumina 4.06 
Magnesia 20. 50 
Iron protoxide i . 50 
*Geological Report on Iowa, Wisconsin and Minnesota, p. 600. 
