14 



R. A. F. PENROSE, JR. 



a calcium iodo-chromate (dietzeite) also occur. These and other 

 rare combinations that are found in the region are, however, in small 

 quantities and are only mineralogical curiosities. 



The iodine in the crude nitrate is an important material on account 

 of its commercial value. It is a very constant ingredient in the depos- 

 its, though in minute quantities, generally only a fraction of i per 

 cent., and occurs usually in the form of sodium iodate, though a 

 little sodium iodide has also been found. Sometimes the iodine is 



ANALYSES OF CRUDE NITRATE (CALICHE) FROM CHILE 



(i) 



(2) 



(3) 



(4) 



(s) 



(6) 



(7) 



Sodium nitrate 



Potassium nitrate 



Sodium chloride 



Calcium chloride 



Magnesium chloride . . . 

 Potassium perchlorate 



Sodium sulphate 



Magnesium sulphate. . 



Calcium sulphate 



Sodium bi-borate 



Sodiuin iodide 



Sodium iodate 



Ammonium salts 



Sodium chromate 



Insoluble matter 



Combined water, etc. 



28.54 

 trace 

 17. 20 



trace 

 S-40 



3 -43 



2.67 



0.49 



0.047 



0.043 



trace 



40. 



trace 

 trace 



2.07 

 0.79 



41. 12 

 3-43 

 3-58 



0-75 



trace 



10.05 



3.86 



0.05 

 trace 



31.86 

 5.00 



61.97 



5-15 



27-55 



o. 21 

 2.13 

 0.15 

 0.41 



0.43 



0.94 



trace 



distinct 



traces 



0-39 

 0.67 



22.73 



1.65 



41.90 



trace 

 0.94 



3-^3 

 4.80 



0-53 



0.07 

 trace 

 trace 



24.90 



2.50 



24.50 



trace 

 6.50 

 6.50 



4-50 

 0.15 



0.054 

 trace 



22 



28.40 



27.08 

 1-34 

 8.95 

 5-25 

 0.18 

 trace 

 none 

 none 

 2.89 

 0.52 



0.08 

 trace 



47-34 

 6-37 



Total nitrates calculated 

 as sodium nitrate 



Total chlorides calcu- 

 lated as sodium chloride 



Total iodine 



28.54 



17 . 20 

 0.067 



68.00 



21.28 

 0.0064 



44.02 



3-58 

 0.036 



100.00 



66. 29 



27-55 

 0.604 



24. II 



41.90 

 0.045 



100.004 



27 .00 



24.50 

 o-,o35 



28. 20 



14.70 

 0.051 



more abundant in the salt deposits than in the nitrate deposits, but 

 the market demand is supplied by what is obtained as a by-product 

 .n refining the nitrate, and hence the salt is not worked for iodine. 

 Borates occur in many places throughout the arid region of the pampa, 

 mostly in the form of the hydrous borate of sodium and calcium 

 known as ulexite or boronatrocalcite, or in the form of the hydrous 

 calcium borate known as colemanite. In places these materials 

 have been worked to a very considerable extent. Some sodium 

 bi-borate is also found. Sodium sulphate occurs in large deposits 



