Groups, 



1. Ammonia, with 1 "1 



equiv. of water. J 

 Potash 



2. Disulphuret of "1 



Copper J 



Sulphuret of Sil- 1 

 ver J 



3. Native Sulphur ... 

 Bisulphate of "j 



Potash from V 

 solution J 



4. Fused Bisulph. Pot. 



Felspar 



3. Calc Spar 



Nitrate of Potash 



Nitrate of Soda... 



6. Arragonite 



Nitrate of Potash 



7. Sulphate of Soda 

 Permangan. of"! 



Baryta J 



8. Euclase 



Zoisite 



9. Silica 



Chabasie' 



10. Mohsite' 



Eudyalitc 



II. Baryta Harmotome 



Lime do. 



Stilbite (Desmin.) 



Formula;. 



Ca3 

 Na3 



k3 



NH3+HO 



KO 



CujS ^ 



AgS 

 S 



ks+Hs 

 ks+Hs?* 



k S+ Al Si3 

 CaO+CO., 

 K O+N O5 



NaO+NOs 

 CaO+COo 

 K O+N O, 

 NaO-fSOj 



BaO+MncjOy 

 BeSP+aAlSi 



Ca3Si+2AlSi 

 Si 03~^ 



^Si^-f-SAl'siZ+lOH 



Common Form. 



Authority. 



Fe, Te. Fe ? 



Na Cl+(Na3 Si2+Ca3 sia 

 + ZrSi4-£eSi) 



Si«+7AlSi«+36H 



2Ba3U 



CasJ 

 Casl 

 k3 J 



Si«+4AlSi2-f-18H 



CasJ 



+ AlSi3+ 6H 



Octohedrons and "1 

 Rhom.of71° SCJ 



Octohedrons. 



Ob. Rh. Pr. 



do. 

 Ob. Rh. Pr. 



do. 

 Rhomboid, 

 do. 



do. 

 Rt. Rh. Pr. 



do. 

 Rt. Rh. Pr. 



do. 

 Ob. Rh. Pr. 



do. 

 Rhomb of 94° 15' 



do. 94° 46 



do. 73° 43' 



do. 73° 40' 



Rt. Rh. Pr. M M' 



= 92° 41' 1 



do. 



do. 91° 16'?^ 



Mitscherlich. 



H. and G. Rose. 



They replace each 

 other in Fahlerz. 

 Mitscherlich. 



Frankenheim ( Pog. 

 Annal., xl. 447.) 

 Mitscherlich. 



Brooke, L. and Ed, 

 Phil. Mag., X. 266 

 and xii. p. 406. -f- 



Johnston, Ibid, ix 

 p. 166. 



Kohler, Pog. Ann, 

 xxxvii. 572. 



do. 



do. 



* I have marked this formula as doubtful, for though the abstract of Mitscherlich's paper 

 in PoggendorfF's ^ww, xxxix. p. 196, is silent on the subject, yet Berzelius (y/csftera^t-to', 

 1837, p. 126) says that the fused crystals have a diflerent composition. The Berlin Trans- 

 actions containing Mitscherlich's entire paper have not yet reached this country. 



f The plane M on Euclase assumed by Phillips and Levy as the primary has not been 

 observed on zoisite, but when in like position the corresponding planes on the two minerals 

 have the same angular relations. Thus the two angles observed by Phillips in Euclase to 

 measure 107-20 and 121-30 respectively, were found by Brooke in Zoisite to be 107*21 and 



'^'°{I?- 



Both also possess the brilliant cleavage from which Euclase derives its name. 



\ Levy gives 31 on M in Harmotome and Stilbite respectively 110^*0 and 94° 11' The 

 former must obviously refer to other planes than these of Kohler. 



