414 EEPORT UNITED STATES GEOLOGICAL SURVEY. 



ANALYSIS. 



(Hardness, 6.5 to 7.) 



Per cent. 



Silica 94.0 



Lime and ferric oxide 1.0 



Water 5.2 



100. 2 



No. 3. Specimen from the head of branch of Witch CreeJc, in the Heart 

 LaJce Geyser Basin. — This specimen was found on a bank or side of a 

 liill where the springs were all dead, and the deposits were evidently 

 older than in most other parts of the basin. 



ANALYSIS. 



(Hardness, 7.) 



Silica 



Water 



Alumina, lime, iron, undetermined. 



Per cent. 



94.1 



1.0 



95.1+ 



No. 4. Specimen from JSTo. 66, Gibbon Geyser Basin. — ^This specimen 

 came from the site of an old spring, one that has probably been dead 

 for many years. In connection with the specimeD, hyalite is found, 

 which is evidently a spring deposit much altered. 



ANALYSIS. 



(Fracture, conchoidal; hardness, 5.5; color, white.) 



Silica 



Water 



Aluminum and iron oxides, traces. 



Per cent. 



95.4 



2.5 



97.9+ 



The following table gives the comparison of these specimens with the 

 type specimen, and with quartz, and opal, and geyserite : 



Specimens. 



Silica. 



Water. 



94.0 



5.3 



94.0 



5.2 



94.1 



LO 



95.4 



2.5 



95.0 



1.5 



87.0 



10.0 



93.0 



7.0 



99.0 



0.3 



Hardness. 



No.l 



No.2 



No.3 



No.4 



Type specimen (report of 1872) 



G-eyserite 



Opal 



Quartz 



6.5to7 

 6. 5 to 7 



7 



5. 5 

 6 to e". 5 



5.1 

 5. 5 to 6. 5 



7.0 



The next table presents, for comparison, all the analyses of Pealites 

 that have been made : 



