638 MINERALOGY 



Sulphohalite, 3 Na2SO 4 .2 NaCl ; Colorless ; Vitreous ; 



H. 3.5; G. 2.50; F. 1.5; I. 

 P. Shows no chlorine. 

 THENARDITE. Na 2 SO 4 ; Colorless to brownish; H. 



2-3; G. 2.69; F. 1.5-2; IV; p. 527. 



d. It shows a potassium flame (violet), p. 563. 



a. With cobalt solution shows aluminium, p. 568. 

 Kalinite, KA1(SO 4 ) 2 .12 H 2 0; Colorless; Vitreous; H. 



2-2.5; G. 1.75; F. 1; I; p. 542. 

 f3. With copper oxide shows chlorine, a, p. 580. 

 KAINITE. MgSO 4 .KC1.3 H 2 O ; Colorless; H. 2.5-3; 



G. 2.13; F. 1.5-2; V; p. 534. 



\. With cobalt solution shows magnesia; a, p. 567. 

 Picromerite, MgSO 4 .K 2 SO 4 .6H 2 O; White; H. ?; G. 



2.15; F. 1.5-2; V; Yields water. 

 Langbeinite, 2 MgS0 4 .K 2 SO 4 ; Colorless; H. 3-4; G. 



2.81; F. 1.5-2; I; Yields no water. 

 8. With sodium hydroxide yields ammonia ; p. 565. 

 Taylorite, K 5 (NH 4 )(S0 4 )3; Yellowish white; H. 2; 



Massive. 



. Shows calcium ; 6, p. 566. 

 Syngenite, CaK 2 (SO 4 ) 2 .H 2 O ; Colorless; H. 2.5; G. 



2.60; F. 1.5-2; V. 



e. With cobalt solution shows aluminium ; p. 568. 

 Alunogen, A1 2 (SO 4 ) 3 .18H 2 O ; White; H. 1.5-2; G. 



1.70; V; Fibrous. 

 Tschermigite, NH 4 A1(SO 4 ) 2 .12 H 2 O ; White; H. 1-2; 



G. 1.50; I ; Yields NH 3 with NaOH. 

 /. With cobalt solution shows magnesium ; a, p. 567. 

 + . With sodium hydroxide shows ammonia, p. 565. 

 Boussingaultite, MgSO 4 .(NH 4 ) 2 S0 4 .6 H 2 O ; Colorless; 



G. 1.7; V. 



. It yields no ammonia. 

 EPSOMITE, MgSO 4 .7 H 2 ; White; Vitreous; H. 



2-2.5; G. 1.75; F. 1 ; IV; p. 538. 

 Kieserite, MgSO 4 .H 2 ; White, gray, yellow ; H. 



3-3.5; G. 2.56; F. 2-3?; V; p. 539. 

 g. Entirely volatile, boiled with NaOH shows ammonia. 

 Mascagnite, (NH 4 ) 2 S0 4 ; White; Vitreous; H. 2-2.5; 



G. 1.77; F. 1; IV. 

 h. Dissolved in borax on wire shows manganese ; a, p. 574. 



