254 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
BAURXITE. 
Two samples from Jacksonville, Calhoun County, Alabama. Alkalies, lime, and 
magnesia not looked for. Analyses by W. F. Hillebrand. 
BRUCITE. 
From Texas, Lancaster County, Pennsylvania. Analysis by E. A. Schneider. 
Mig Os secncincevk cate edinanjevgys¥ Saw ane seins oe saves ica inci ns cmenek ee elas seu ememaeceiinaieesees, 67.97 
MnO een sees osregeont evameusans sevaenae idee ae cwicievctats oiedivlbiemlenesd aceedncem en ehisieie gemieciciae 97 
PO@jO gsc eand ciareteec me swik sine Hoes eee seaeas cae eun genet necmeends ode enoesiieceeeiees 39 
HMisO! 8G 10S sex. cnececteeee wat ds aseains es be Pewee yee sacle ee cate otasmaietieneeans _ 18 
TgOy igMmition:.<:22. cco Sie nadeage tages SiSeeades See eERseeeee eres case eeeees 30. 63 
PSILOMELANE. 
From a prospect hole on plain south of Round Mountain, Silver Cliff, Colorado. 
Analysis by W. F. Hillebrand. There were strong spectroscopic reactions for strontia 
and lithia, but these bases were not estimated. A little insoluble gangue is included 
with the silica. 
H20 below 120°.............-- 
H20 above 120°.........-.-.-. 
HETZROLITE. 
From Sterling Hill, New Jersey. Collected by C. Palache. Analysis by W. T. 
Schaller. Sp. gr., +.85. 
Alz:03, CaO, and MgO absent. 
@ State of oxidation uncertain. 
