SERPENTINE CONTAINING UNUSUAL AMOUNT OF WATER. 413 



Glaucophane Schist. — Glaucophane schist is found in Piue caiion on the 

 road to the summit of the mountain. A fragment from a bowlder out of 

 place in the bed of the creek was analyzed. Its color is that of the well- 

 known species, bluish with streaks of green. Its schistose structure was 

 well marked, while innumerable cinnamon-colored garnets were distributed 

 throughout the mass. Often garnets are wanting in glaucophane schist. 

 So also calcite may or may not be found in these schists. 



Analysis of Glaucophane Schist fi'om Pine Canon. 



(272) 



H^O at 100° C 0.17 



HjO above 100° C 1.81 



Sib^ 47.84 



P2d5 0.14 



AI2O3 16.88 



Fe^O.^ 4.99 



Feb 5.56 



MnO 0.56 



CaO 11.15 



MgO 7.89 



KjO 0.46 



Na20 320 



100.65 



Peculiar Serpentine. — A serpentine or talc of peculiar character was found 

 in a bowlder out of place in the bed of the creek in Ferguson ravine. It 

 appeared peculiar because it possessed the characters both of serpentine and 

 talc. Its olive color, waxy luster, crystalline structure, and absence of fibers, 

 apart from the well-developed cleavage planes which were apparent, led me 

 to believe it a talc. 



White seams traverse the specimen in all directions, and carry chromite. 

 This white mineral appeared in part much like chrysotile, from its hardness 

 and fibrous character. Some sulphuric acid w^as found in it; hence it is 

 probable that sulphate of lime forms a small portion of the white material. 



It appears to me that this rock is a serpentine. The analysis shows 

 it to contain an extraordinary amount of water. Its composition is as 

 follows : 



