Jrom the Tilly Foster Iron Mine. 375 
7. Crystalline massive forms, after hornblende. 8. Foliaceous to 
massive forms, after biotite. 9. Rhombohedral, after dolomite. 
B. Consisting of Brucite (hydrate of magnesia).—12. Foliated 
forms, after dolomite. 
C. Consisting of Magnetite—13. Rhombohedrons, ajfler dolo- 
mite. 14. After chondrodite and other minerals. 
ge Consisting of Pyrrhotite—15. Plates after serpentine (that 
or No. 11 
E. Consisting of Dolomite—16. Pseudomorphs, after crystals 
of chondrodite. 
A. SERPENTINE, OR SERPENTINE-AND-DOLOMITE, PSEUDOMORPHS. 
1. Cubie Pseudomorphs. 
Silica Magn 
41°87 42-43 13°40 2°30 = 100 
and, accordingly, it is the common kind. oe 
e dolomite of these compound pseudomorphs is white and 
translucent, like ordinary crystalline dolomite. Owing to the 
