180 Arrangement of Minerals. 



** Stro7ititic Spars. 

 4. Strontinnite or Peritomous Heavy-Spar ( Carbonate ofStrontites). 

 6. Celestine or Prismatoidal Heavy-Spar {Sulphateof Strontites). 



Subclass II. UALOCRALClTE.-^Saluie Ores. 

 Tasteless compounds of Metals and Acids. 



Order I. BARALOCHALCITE.— JT^^t^y Saline Ores. 

 Not metallic. No metallic pearly lustre. Streak white, 

 pale bro^vn, orange-yellow. Hardness = 2.0 — 5.5. Sp. gr. 

 = 3.3 — 8.1. 



Genus I. Sparry-Iron. 

 Rhombobedral. Cleavage rhombohedral. Streak white. Hard- 

 ness = 3.5 — 4.5. Sp. gr. = 3.829. 



1. Rhombohedral Sparrj^-Iron, or Carbonate of Irgn. 



Genus II. Red Manganese. 

 Rhombohedral. Cleavage rhombohedral. Colour red. Hard- 

 ness =3. 5 — 4.5. Sp. gr. = 3.5. 



1. Rliombohedral Red Manganese (^Manganese oxide carbonate, H.). 

 2. Isometric Red Manganese. 



Genus III. Retine-Spar. 

 Pyramidal. Prismatic. Streak brown... grey. Hardness = 4.5 

 — 5.5. Sp.gr. = 3.6— 4.6. 



1. Pyramidal Retine-Spar {Phosphate of Ytti'ia). 2. Prismatic Retina- 

 Spar {Pho spha te of Manganese) . 



Genus IV. Tungsten. 

 Pyramidal. Hardness = 4.0 — 4.5. Sp. gr. = 6.0 — - 6. 1 . 

 1. Pyramidal Tungsten, or Tungstate of Lime. 

 Genus V. Calamine. 

 Prismatic. Rhombohedral. Streak white. Hardness = 5.0 — 5.5. 

 Sp. gr. = 3.3. — 4.5. 



1. Prismatic Calamine, or Electric Calamine {Hydrous silicate of 

 Zinc). 2. Rhombohedral Calamine {Carbonate of Zinc). 3. 

 Williamsite {Anhydrous silicate of Zinc). 

 Genus VI. Lead-Spar. 

 Rhombohedral. Pyramidal. Prismatic, and Hemiprismatic. Hard- 

 ness = 2.0 — 4.0. Sp. gr. = 6.0 — 8.1. 



1. Peritomous Lead-Spar {MuriateofLeadofMendip). 2. Diprisma- 

 tic Lead-Spar {Carbonate of Lead. White Lead-Spar.) 8. Rhom- 

 bohedral Lead- Spar {Phosphate of Lead. Griin und Braun 

 Bleierz of Wern.) 4. Macrotypous Lead-Spar {Griin Bleierz, W. 

 Plomb phosphaK: Arsenifere, H.) 6. Hemiprismatic Lead-Spar 



