MINERALS. 257 
Insoluble, inorganic........-......2.2.. 0022s eee eee eee eee 0.02) 0.22) 292] 0.40 4.10 
Tosoluble, OPBAMIC 2.2 sie sxiemmines <cemetejsaincnces pay asmiey ene thscsionaen| peatneee i 12 3127 
1g... Di parece 
CL... 
VII. SILICATES. 
PETALITE. 
From Peru, Maine, associated with spodumene. Analysis by F. W. Clarke. 
ORTHOCLASE AND MICROCLINE. 
A. Orthoclase from Silver City, Idaho. Occurs as a gangue mineral. Partial 
analysis by W. F. Hillebrand. 
B. Orthoclase from Mitchell County, North Carolina. Large cleavage mass. 
Analysis by E. T. Allen. See Am. Jour. Sci., ser. 4, vol. 19, p. 119. 
C. Feldspar crystal from the nevadite of Chalk Mountain, Summit County, 
Colorado. Analysis by W. F. Hillebrand. 
D. Pink orthoclase crystals, from gray porphyry, Johnson Gulch, near Leadville, 
Colorado. Described by Cross in Mon. XII, Appendix A. Analysis by W. F. Hille- 
brand. 
E. Feldspar separated from gabbro. East side of North Fowl Lake, Minnesota. 
Analysis by W. F. Hillebrand. . 
F. Feldspar from the elolite syenite of Litchfield, Maine. Described by Bayley in 
Bull. 150, p. 201. Analysis by W. H. Melville. 
A. B. Cc. D. E. F. 
66. 28 \. . . . 65. 14 
BAO BO atte concerned once sone } cif} .2of 100} Bi} oa 
