Arrangement of Minerals. 369 



1. Dodecahedral Bismuth-Blende ( PTumM^AWoK/e of BreWiaupt, 

 Arsenikwismuthy in part, of Werner). 



Genus III. Cadmium Blende. 

 Rhombohedral. Streak orange-yellow. Hardness =3.5. Sp. gr. 2.8. 

 1. Rhombohedral Cadmium Blende or Grecnockitc, Jam. {^Sulphurct 

 of Cadmium, Con.) 



Genus IV. Zinc-Blende, or Garnet-Blende. 

 Tessular. Streak white — reddish-brown. Hardness = 3.5 — 4.0. 

 Sp.gr. =4.0 — 4.2. 



1. Dodecahedral Garnet-Blende {^Zinc sulphure, H.) 



Genus V. Antimony-Blende — Purple Blende. 

 Hemiprismatic. Streak cherry-red. Hardness = 1.0 — 1.5. Sp. 

 gr. = 4.5 — 4.6. 



1. Prismatic Antimony-Blende {Red Antimony. Antimoine ojcyd^ 

 sulphure, H.). 



Genus VI. Ruby-Blende. 

 Rhombohedral. Hemiprismatic. Streak red. Hardness = 2.0 

 ^ 2.5. Sp. gr. = 5.2 — 8.2. 



1. Rhombohedral Rubj-Blende {Ruby Silver. Argent antimonie 

 sulphure, H. Rothgiltigerz, W.) 2. Hemiprismatic Ruby-Blende 

 {Rothgiltigerz, W. Myargyrite, R.) 3. Peritomous Ruby- 

 Blende {Cinnabar. Mercure sulphure, H. Zinnober, W.). 



Order VI. SULPHUR. 

 Not metallic. Colour red, yellow, brown. Streak red, 

 yellow — white. Hardness = 1.5 — 2.5. Sp. gr. = 1.9 — 3.6; 



Genus I. Orpiment. 

 Prismatoidal. Hemiprismatic. Streak lemon-yellow, orange -yel- 

 low, aurora-red. Hardness = 1.5 — 2.0. Sp. gr. = 3.4 — 3.6. 



1. Prismatoidal Orpiment {Yellow Orpiment. Yellow sulphuret of 

 Arsenic. Arsenic sulphure jaunc. Gelbes Rauschgelb). 2. He- 

 miprismatic Orpiment {Red Orpiment or Realgar. Red sulphuret 

 of arsenic. Arsenic sulphure rouge. Rothes Rauschgelb). 



Genus II. Sulphur. 



Prismatic. Streak white — sulphur-yellow. Hardness =1.5 — 

 2.5. Sp. gr= 1.9 — 2.1. 



1. Prismatic Sulphur {Common Sulphur. Soufrc, H. Natiirlichcr 

 Schwqfel, W.). 



