PREFATORY NOTE. 



This Appendix, prepared with the co-operation of Professor Dana, is intended as one of 

 a series to be published from time to time. It includes descriptions of 87 minerals an- 

 nounced as new, arid also some important facts regarding a few old species, published since 

 the appearance of the Mineralogy in 1868. 



An alphabetical arrangement is adopted for convenience of reference. The species in- 

 cluded, arranged according to the general subdivisions in the classification of minerals, are 

 as follows : — 



1. Diamond. 



1. Native Elements. 



I 2. Maldonite. 



2. Sulphids, Arsenids, etc. 



3. Arsenical Cobalt, Einfach-Arsenik-Cobalt. 



4. Beyrichite. 



5. Diaphorite. 



6. Dyscrasite : Stibiotriargentite, Stibiohex- 



argentite. 



7. Epiboulangerite. 



8. Epigenite. 



9. Glaucopyrite. 

 10. Julianite. 



11. Klaprotholite. 



12. Metacinnabarite. 



13. Orileyite. 



14. Osbornite. 



15. Polyargyrite. 



16. Kionite. 



17. Tellux-wismuthsilber. 



18. Wolfachite. 



19. Sylvanite. 



3. Chlorids, FliMrids. 



20. Xadorite, Sb, Pb, CI, 0. 



21. Xantokite, Cu 2 CI. 



22. Ralstonite, Al, Fl, H. 



23. Sellaite, Mg Fl. 



24. Chrompicotite /Spinel group). 



25. Ilsemannite, Mo + 4Mo. 



26. Jacobsite (Spinel group). 



27. Lithiophorite (near Asbolan). 



Oxyds. 



28. Namaqualite (near Hydrotalcite). 



29. Rabdionite. 



30. Brookite. 



31. Tridymite. 



5. Anhydrous Silicates. 



32. Amblystegite CHypersthenite). 



33. Aspidolite (Mica Group;. 



34. Asteroite (Pyroxene;. 



35. Barettite. 



36. Bismutoferrite. 



37. Hortonolite (Chrysolite Group). 



38. Monzonite. 



39. Roepperite (Chrysolite Group). 



