Mineralogy mid Geology of the White Moutitains. 109 



Fig. 3. 



moist litmus paper held over the solution is reddened by the car- 

 bonic acid evolved, and the color is discharged in drying ; spe- 

 cific gravity 2.61. From the external characters this is a true 

 clinkstone, which Gmelin has shown (Edin. New Phil. Journal, 

 vol. vii, p. 68,) consists of mesotype and feldspar. 



