tT8 Arrmigeinent of Minerals, 



1. Green Vitriol or Sulphate of Iron (Ilemiprismatic Vitriol). 



2. BliLc Vitriol or Sulphate of Copper (Tetartoprismatic Vitriol). 



3. White Vitriol or Sulphate of ^inc (^Prismatic Vitriol). 



Genus XIII. Botryogene or Red Sulphate of Iron. 

 Hemiprismatic. Streak ochre-yellow. Taste feebly astringent. 

 Hardness = 2.0 — 2.5. Sp. gr. = 2.04. 

 1. Hemiprismatic Botryogene. 



Genus XIV. Johannite or Uranium Vitriol. 

 Hemiprismatic. Taste bitter and astringent. Hardness = 2.0 

 — 2.5. Sp.gr. 3.19. 



1. Hemiprismatic Johannite. 



CLASS II. 



Characters of (he Class. — Specific Gravity more than 1.8. 

 Tasteless. 



A- Haloidal IXEinerals. 



Tasteless compounds of Earths and Acids, and of Metals 

 and Acids. 



Subclass I. HALLITE. — Saline Minerals. 

 Tasteless compounds of Earths and Acids. 



Order I. KUPHALLITE.— i^>A^ ScUin£ JMi^rals. 



Not metallic. Cleavage never distinctly axotomous ; in 

 thin plates not elastic. Streak white, red, blue. Hardness 

 1.5 _ 5.0. Sp. gr. = 1.9 — 3.2. 



t • 



Genus I. Gypsum. 

 Prismatic. Hemiprismatic. Cleavage very distinctly monotomous ; 

 flexible in thin plates. Hardness = 1 .5 — 2.0. Sp. gr. = 2.2 — 2.4. 

 1. Prismatoidal or common Gypsum. 



Genus II. Anhydrite. 

 Prismatic. Cleavage in three rectangular directions. Hardness 

 =3.0 — 3.5. Sp. gr. = 2.8 — 2.9. 

 1. Prismatic Anhydrite. 



Genus III. Gay-Lussite. 

 Hemiprismatic. Hardness = 2.5 Sp. gr. = 1.9. -^ 1.95. 

 1. Hemiprismatic Oay-Liissite. 



