406 



A TREATISE ON METAMORPHISM. 



Table D. — Classification of alterations, with volume changes — Continued. 

 OXIDATION, DECARBONATION, AND. DESULPHIDATION. 



Volume 

 change. 



Siderite, marcasite 

 Siderite, pyrite 



Magnetite 

 do ... 



Per cent. 

 -47. 14 

 -46. 67 



OXIDATION, HYDRATION, AND DECARBONATION. 



OXIDATION, HYDRATION, AND DESULPHIDATION. 



Marcasite . . 



Pyrite 



Pyrrhotite . 



. Limonite 



do ... 



do .. 



- 0.14 

 + 2.93 



+24. 68 



OXIDATION AND DESULPHIDATION. 



Marcasite . . 

 Pyrite 



Pyrrhotite '. 



Magnetite 

 ....do ... 

 do ... 



-39. 34 

 -37. 48 

 -24. 27 



SILICATION. 



Corundum, quartz. 

 Do 



Gehlenite 



Oehlenite, quartz. . 



Olivine, quartz 



Nephelite, quartz.. 



Cyanite 



Sillimanite 



Grossularite - - 



do 



Anthophyllite 

 Albite 



- 6.59 



+ 4.38 



— 4.42 

 -18. 56 



- 1.48 



— .41 



