486 MINERALOGY. 



ORDER II. WATER. 



Liquid; tasteless, or with sensible taste and smell. Sp.gr. 1.1 

 1.0269. 



Gen. 1 . Atmospheric water. 2. Sea water. 



ORDER III. ACID. 

 Sp. gr. = 0.0045, 3.7. Acid. 



Gen. 1. Carbonic acid. 2. Muriatic acid. 3. Sulphuric acid. 4. Bo- 

 racic acid. 5. Arsenic acid. 



ORDER IV. SALT. 

 Sp. gr. - 1.2, 2.9. Solid. Not acid. 



Gen. 1. Natron. 2. Glauber Salt. 3. Nitre. 4. Rock Salt. 5. Sal 

 Ammoniac. 6. Vitriol. 7- Epsom Salt. 8. Alum. 9. Borax. 

 10. Glauberite. 



CLASS II. 



Specific gravity above 1 .8. Insipid. 



ORDER L HALOIDE. 



No metallic lustre ; streak white or gray. Hardness = 1.5, 5.0. 

 Sp. gr. 2.2, 3.3. 



Gen. 1. Gypsum. 2. Cryolite. 3. Alumstone. 4. Fluor. 5. Apa- 

 tite. 6. Limestone. 



ORDER II. BARYTE. 



No true metallic lustre ; streak white and gray, or orange-yellow. 

 Hardness r= 2.5, 5.0. Sp. gr. = 3.3, 7-3. If adamantine, or 

 imperfect metallic lustre, the sp. gr. 6.0, and more. If the 

 streak is orange-yellow, the sp. gr. = 6, and more, and the hard- 

 ness =r 3.0 and less. If the sp. gr. is under 4.0, and the hard- 

 ness = 5.0, the cleavage is diprismatic. 



Gen. 1. Sparry Iron. 2. Red Manganese. 3. Calamine. 4. Tungs- 

 ten or Scheelium. 5. Baryte. 6. Lead Spar. 



ORDER III. KERATE. 



No metallic lustre ; streak white or gray ; no single distinct cleav* 

 age. Hardness = 1.0, 2.0. Sp. gr. 5.5. 



