APPENDIX. 



19 



463. Sdtrynite. Ulricli now regards this species as belonging to the finite group (Con- 

 trib. Min. Victoria, p. 24). 



98. Syhoamte. Schrauf's recent crystallographic researches makes this species ortho- 

 rhombic in crystallization. He says that he has observed the twins described by Kokscharof ; 

 and that the angles and planes are given rightly by Miller ; and that he has observed 17 

 new planes. (Jahrb. Min., 1871, o94.) 



TridymUe. This new variety of silicic acid, discovered by v. Eath (p. 805, this Min.) 

 in Mexican porphyry, has been found in many localities in Europe ; it is especially well charac- 

 terized in the trachyte of Drachenfels and in the orthoclase-porphyry of Waldbockelheim. 



610. Wolframite. Des Cloizeaux has shown that this species is monoclinic in crystalli- 

 zation. C. E. box. 868. 



