672 MINERALOGY 



BIOTITE, (K.H) 2 (Mg.Fe) 2 (Al.Fe 2 ) 2 (Si0 4 ) 3 ; Green, yel- 

 low, black; Cl. basal; H. 2.5; G. 2.90; F. 5; V; 

 p. 492. 



PHLOGOPITE, (H.K) 3 (Mg.Fe)3(Al.Fe)(Si0 4 )3 ; Yel- 

 lowish brown, green, white; H. 2.5-3; G. 2.86; 

 F. 4.5-5; V; p. 494. 



**. Shows no potassium. 



CLINOCHLORE, HgMgaAlaSisOig ; Green of various 

 shades; H. 2.2; G. 2.72; F. 5; V; p. 497. 



y. Not decomposed with H 2 SO 4 . 



*. Yields a potassium flame through the blue 

 glass ; Micaceous. 



MUSCOVITE, H 2 KAl 3 (Si0 4 )3 ; White, brown, green, 

 yellow; H. 2-2.5 ; G. 2.86; F. 4.5-5; V; p. 489. 



Alurgite, H(K.Mg.OH) 2 (Al.OH)Al(SiO 3 ) 4 ; Rose-red to 

 deep red ; Pearly ; H. 3 ; V. 

 Yields water ; Not micaceous. , 



HARMOTOME, (Ba.K 2 )Al 2 Si 5 O 14 .5 H 2 O; White; Cl. 

 pinacoidal; H. 4.5 ; G. 2.47; F. 3 ; V; p. 482. 



Mordenite, (Ka.Naz.Ca) Al 2 Si 10 O 24 .6f H 2 O ; White, 

 yellow, pink; Cl. pinacoidal; H. 3-4; G. 2.15; F. 

 4-5; V. 



**. Shows no potassium. 



Paragonite, H 2 NaAl 3 (SiO 4 ) 3 ; Yellow to grayish white; 

 Pearly ; H. 2.5-3 ; G. 2.89 ; F. 5 ; V. 



MARGARITE, H 2 CaAl 4 Si 2 O 12 ; Pink, gray, white; 

 Pearly; H. 3.5-4; G. 3.05; F. 4-4.5; V; p. 496. 



. Yields no water. 



Leucophanite, Na(BeF)Ca(SiO 3 ) 2 ; Pale green, yellow, 



white ; Cl. basal ; H. 4 ; G. 2.96 ; F. 2.5-3 ; IV. 

 2. Hardness above 5. 



+ . Yields water in the closed tube, some only upon 



intense ignition. 

 a. Decomposed or soluble in HC1. 



<. Fuses with swelling or intumescence. 



CHABAZITE, (Ca.Na2)Al 2 (Si0 3 ) 4 .6 H 2 O; White, yel- 

 low, red ; Cl. rhombohedral ; H. 5 ; G. 2.12 ; F. 3 ; 

 III ; p. 484. 



APOPHYLLITE, H 7 KCa 4 (Si0 3 ) 8 .4| H 2 O ; White, yel- 

 low, rose, pale green ; H. 5 ; Cl. basal ; Pearly ; 

 G. 2.35 ; F. 2 ; II. p. 480. 



