274 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
The final alteration of the Stoneham topaz is into muscovite, q. v. The alteration 
product here given represents the beginning of the process. 
SILLIMANITE. 
Fibrolite adze from Brittany. Sp. gr., 3.147, determined by William Hallock. 
Analysis by F. W. Clarke. See Bull. 60. 
KYANITE. ‘ 
Pale-green variety, associated, with the dumortierite of Clip, Arizona. Analyzed 
by W. F. Hillebrand. Titanic oxide is present in appreciable amounts, but was not 
separated from alumina. The mineral contained a few black, nonmagnetic grains, 
which may have carried the titanium. Sp. gr., 3.656 at 18.5° 
ILVAITE. 
From Golconda mine, South Mountain, Owyhee County, Idaho. Analysis by W. 
F. Hillebrand. Sp. gr., 4.059 at 31°. 
\ 
CALAMINE. 
White, highly crystalline. From Sterling, New Jersey. 
Steiger. 
FEO B10 sa nrcasesmsnaane 
H20 above 100° 
LAWSONITE. 
From Tiburon Peninsula, California. Collected by F. L. Ransome. Analysis by 
W. F. Hillebrand. 
