MINKKAI.S ALKALINE AFTER ICMTION fill] 



Parisite, (V((VF)(CaF)(CO,),; YellmvM, brown to 



brown; <'l. basal ; H. 4.5 ; Inf; (I. 1.36; III. 

 6. In tin' i-lo-ctl tube yields water. 



Thaumasite, ( a( '(),.( 'aSi( ) 3 CaSO 4 . 15 H 2 O; White; 



H. 3.5; G. 1.87; F. Difficult ; [II; FSbroiU. 

 c. In S. Ph. a green bead (uranium .1. 



Uranothallite, Ca*U (CO 3 ) t .W H 2 O; Yellowish gr -n ; 

 H. 2.5-3; IV; Tabular. 



4. Upon ignition in the forceps it yields an intense yellow 



flame (sodium). 



a. In the closed tube it yields water. 

 GAYLUSSITE, Na,Ca(CO 3 ) 2 .5 H 2 O; White to gray; 



Cl. prismatic; H. 2-3 ; G. 1.99; F. 1.5; V; p. -KM. 

 Dawsonite, Na(A1.2 OH)CO 3 ; White; H. 3.5; G. 



2.40; F. 4.5-5; V; Radiated. 

 Pirssonite, Na2Ca(CO 3 ) 2 .2 H 2 O ; White to gray ; H. 



3-3.5; G. 2.35; F. 1.5; IV. 



b. In the closed tube it yields no water. 



The nitric acid solution yields a precipitate with 



AgN0 3 (chlorine). 

 Northupite, MgNa2(CO 3 ) 2 Cl ; Colorless to brown; 



H. 3.5-4; G. 2.38; F. 1 ; I. 

 Fused with soda it yields a sulphur reaction. 

 Tychite, MgNa 6 (CO 3 ).,SO4 ; Colorless; H. 3.5; G. 



2.58 ; F. 1 ; I. 



5. It contains magnesium as the base; a, p. 567. 

 a. It yields no water in the closed tube. 



MAGNESITE, MgCO 3 ; White, gray, yellow, brown; 



Cl. rhombohedral ; H. 3.5-4.5; G. 3.06; Inf.; Ill; 



p. 385. 



Breunnerite, (Mg.Fe)CO 3 , Brown, gray; Cl. rhombo- 

 hedral ; 3.5-4.5 ; G. 3 ; Inf. ; III ; p. 385. 

 6. Yields water. 



Hydromagnesite, Mg 2 (Mg.OH) 2 (CO 3 ) 3 .3 H 2 O ; White; 



H. 3.5; G. 2.15; Inf.; V. 

 Lansfordite, Mg2(Mg.OH) 2 (CO s ) 3 .21 H 2 O ; White; H. 



2.5; G. 1.54; Cl. basal ; Inf.; VI. 

 Hydrogioberite, (Mg.OH) 2 CO 3 .2 H 2 O ; White; Cl. 



prismatic; G. 2.16; Inf.; Compact. 

 Nesquehonite, MgCO 3 .3 H 2 O ; White; Cl. prismatic; 



H. 2.5; G. 1.84; Inf.; IV. 



