SPECIFIC GRAVITY TABLES. 



97 



4th. BASIC CARBONATES, AND HYDRATED DOUBLE 

 CARBONATES. 



Name. 



^^ Sodium potassium 



carbonate, 

 *' (( « « 



^^ Gay-Lussite. 

 ^^ Hyclrodolomite. 

 ^^ « Pennite. 



^^ Pencatite. 

 22 „ 



^^ Predazzite. 



^* Hydromagnesite. 



^^Zaratite. 



Formula. 



K Na C O3. 12 H2 0. 



(( 

 Na2C03.CaC03.5H.,0. 

 CaCO3.2MgCO3.H2O. 



Ca C O3. Mg H., O3. 



(( 

 2 Ca C O3. Mg H, O2. 

 3MgC03.MgH302-3H,0 

 NiC03.2NiH,02.4H,b. 



Specific 

 Gravity. 



1.6088. \ 



1.6334. r^- 



1. 928-1. 950. 



2.495. 



2.86. 



2.613. 



2.57. 



2.634. 



2. 145-2. 180. 



2.57—2.693. 



Boiling 

 Point. 



Melting 

 Point. 



AUTHORITIES. 



