682 MINERALOGY 



HYPERSTHENE (Mg.Fe)Si0 3 ; Brownish green to 



greenish black ; Pearly ; Cl. pinacoidal ; H. 5-6 ; G. 



3.45; IV; p. 421. 

 ANTHOPHYLLITE, (Mg.Fe)SiO 3 ; Gray, clove brown, 



green; Pearly; Cl. prismatic ; H. 5.5-6; G. 3.10; 



IV. 

 SPINEL, Mg(AlO) 2 ; Various colors ; H. 8 ; G. 3.5-4 ; 



I; p. 371. 



Yields a zirconium reaction a, p. 571. 

 ZIRCON, ZrSi0 4 ; Brown, white, gray, green, red; Cl. 



prismatic ; H. 7.5 ; G. 4.68 ; II ; p. 456. 

 Baddeleyite, Zn0 2 ; White, yellow, brown, black; Cl. 



basal ; H. 6.5 ; G. 5.5 ; V. 

 Shows beryllium, a, p. 571. 

 BERYL, Be 3 Al 2 (Si.O 3 ) 6 4H 2 0; White, green, yellow, 



blue, pink ; H. 7-7.5 ; G. 2.69 ; III ; p. 436. 

 PHENACITE, Be 2 SiO 4 ; White ; Cl. prismatic ; H. 7.5-8 ; 



G. 2.96 ; III ; p. 452. 

 Powdered and reduced with soda yields magnetic 



particles. 



Hercynite, Fe(AlO) 2 ; Black ; H. 7.5-8 ; G. 3.93 ; I. 

 Extremely hard. 

 DIAMOND, C ; Colorless, yellow, red, blue, gray, black ; 



Cl. tetrahedral; H. 10; G. 3.52; p. 281. 



