262 H. TV. TURNER GEOLOGY OF THE SILVER PEAK QUADRANGLE 



Bf} •■» 



H 2 0— 10 



H 2 + 1.56 



CO, 65 



P 2 5 07 



S0 3 none 



CI none 



F 88 



BaO none 



99.92 

 Less O equal to F 36 



99.56 



Boron was looked for, but not detected by blowpipe test. 



SERPENTINE 



In the Palmetto mountains, at the south end of the quadrangle, there 

 are a few small masses of serpentine. These areas lie at the contact of 

 quartz-monzonite and other rocks, in part meta-rhyolite and in part 

 limestone or dolomite and chert. There is more or less carbonate of lime 

 in the serpentine and frequently bunches of pyroxenite, and the pyroxene 

 of this rock appears to be the original mineral of the serpentine. An 

 analysis of the pyroxene shows it to approximate to diopside in compo- 

 sition. 



Analysis of Pyroxene from Specimen Number 323 



George Steiger, Analyst 



Si0 2 46.04 



A1 2 3 1.21 M 



Fe 2 3 5. 24" 



MgO 16.98 



CaO 25.23 



It has been shown that diopside is sometimes formed by the metamor- 

 phism of magnesian limestone, 2S the diopside afterwards altering into 

 serpentine. It is regarded as probable that like transformations account 

 for the serpentine of the Palmetto mountains. 



Chloropal 

 In a streak of a light colored felsitic rock inclosed in Ordovician chert, 



23 The yesuvianite was freed from the associated garnet and quartz by means of the 

 Thoulet solution. — H. W. T. 



29 Includes any Ti0 2 and P 2 5 that may be present. 



27 Includes any Fe O calculated as Fe 2 3 . 



23 G. P. Merrill : On the serpentine of Montville, New Jersey. Proceedings of the 

 U. S. National Museum, vol. 11, pp. 105-111. 



