POTASH SALTS AND OTHER SALINES IN THE GREAT BASIN REGION. 89 



Table XXX. — PetrograpMc examination of samples from Searles deep well. 

 [Analyses by J. C. Jones.] 



No. 



Description. 



209 

 211 



212 

 213 



214 

 215 

 216 



217 

 218 



223 

 224 

 22.5 



226 

 227 

 229 



Similar to 221 and 213. 



Fine-Krained tourmaline, biotite, hornblende, plagioclase, and quartz grains recognized. Major part 



of material clay cemented by gaylussite. 

 Larger grains pirssonite. limonite, a few quartz grains. 

 A fine mud cemented by carbonates with a few fragments of quartz, hornblende, tourmaline, and 



iron oxide. 

 Crystals of pirs?onite with inclusions of clay and iron oxide. 

 Mostly crystals of pirssonite. some halite, grains of quartz, clay, and iron oxides, 

 pirssonite in brolcen crystals, limonite, kaolin, biotite, touriiialine, quartz. Fine-grained material 



average diameter, 0.5 inm. 

 Crystals of pirssonite. nodules of limonite, a few grains of quartz, hornblende, plagioclase. 

 Mostly clay and iron oxide cemented by carbonates; some grains of quartz, hornblende, biotite, and 



a few clouded and decomposed orthoclase crystals noted. 

 Mostly clay cemented by pirssonite; mineral fragments of quartz, hornblende, tourmaline, biotite, 



apatite, and many fresh and clouded fragments of microcline, approximately about 25 per cent of 



the mineral fragments left after washing out clay and dissolving carbonates. This is the only 



samv le in whicli feldspar crystals approaching freshness were noted. 

 A fine mud firmly cemented bj' carbonates with a few fragments of quartz, hornblende, and hydrated 



biotite. 

 Oolitic sand; rounded grains composed of minute grains of quartz cemented in part by carbonates 



and iron oxide but retaining form after being acted on by acid. Not a true oolite as no concentric 



structure could be noted. 

 Fine-grained clay grains of quartz, hornblende, biotite, cemented by carbonates. 

 Similar to No. 223. 

 Fine-grained clay, cemented by carbonates, grains of tourmaline, quartz, hornblende, apatite, and 



biotite. 

 Similar to No. 223. 



Grains about 1 millimeter in diameter, gavlussite, limonite, quartz. 

 Similar to No. 225. 



