176 Arrangement of Minerals, 



Genus I. Carbonic Acid. 

 Taste slightly acid. Sp. gr. = 0.0018. 

 1. Aeriform Carbonic Acid. 



Genus II. Muriatic Acid or Hydrochloric Acid. 

 Smell of safFron, and strong acid taste. Sp. gr. = 0.0023. 

 1. Aeriform Muriatic Acid or Hydrochloric Acid. 



Genus III. Sulphuric Acid. 

 If gaseous, the smell is sulphureous. If liquid, the taste is strongly 

 acid. Sp. gr. = 0.0025 — 1.9. 



I. Aeriform Sulphuric Acid, or Sulphurous Acid Gas. 2. Liquid Sul- 

 phuric Acid. 



Genus IV. Boracic Acid. 

 Solid. Sp. gr. = 1.4—1.5. 

 1, Prismatic Boracic Acid. 



Genus V. Arsenious Acid. 

 Solid. Sp. gr. greater than 3.0. 

 1. Octahedral Arsenious Acid. 



Order IV. SALT. 

 Solid. Hardnessrr 1.0 — 3.5. Sp. gr. == 1.4 — 3.2. Taste 

 not acid. Soluble in water. 



-|- Alkaline Salts. 

 * Salts of Soda. 

 Genus I. Natron, or Carbonate of Soda. 

 Prismatic and hemiprismatic. Taste pungent and alkaline. Hard 

 ness = 1.0 — 1.5. Sp. gr. = 1.4 — 1.6. 



1. Hemiprismatic Natron. 2. Prismatic Natron. 



Genus II. Trona, or Sesqui-carbonate of Soda. 

 Hemiprismatic. Taste alkaline. Hardness = 2.5 — 3.0. Sp. 

 gr. =2.1— 2.2. 



1. Prismatoidal Trona. 



Genus III. Glauber Salt or Sulphate of Soda. 

 Prismatic. Taste first cooling, and then feebly saline and bitter. 

 Hardness = 1.5 — 2.0. Sp. gr. = 1.4 — 1.5. 

 1 . Prismatic Glauber Salt. 



Genus IV. Borax, or Borate of Soda. 

 Hemiprismatic. Taste sweetish alkaline, but feeble. Hardness 

 = 2.0 --2.5. Sp.gr. = 1.7 — 1.8. 

 1. Prtsmatic Borax.. 



