SILICATKS, TIT\ I .T< ' 



It is found at many localities along the Atlantic >lupe, as South 

 Mountain, Pennsylvania; Kdenville, NY\v York ; Htuldam, Con- 

 nect ic-ut ; Franklin, Ne\v Jersey; Amelia Court House, Virginia; 

 Mrtiiany < 'hmvh, Iredell County, North Carolina. 



AXINITE 



Axinite. A borosilicate of calcium and aluminium, HCa 3 - 

 AljH(SiO 4 ) 4 ; Composition variable; Triclinic; Type, Centro- 

 symmetric ; & : b : c = .4921 : 1 : .4797 ; a = 82 54' ; f* = 91 52' ; 

 y = 131 32' ; 010 A 100 = 48 21_' ; 100 A 001 = 93 49' ; 010 A 001 = 

 97 50'; 110 A 100 = 15 34'; 110 A 100 = 28 5_3'; Common form, 

 a (100), b (010), c (001), m (110), M (flO), r (111), x (111), e (111) ; 

 Cleavage 010 distinct, Brittle ; Fracture, conchoidal ; H. = 6.5- 

 7 ; G. = 3.27 3.29 ; Color, brown, blue, gray, or yellow ; Streak, 

 white or pale ; Transparent to translucent ; a = 1.685 ; (3 = 1.692 ; 

 Y = 1.695 ; -y a = .010 ; Optically ( ) ; Bx a nearly perpendicu- 

 lar to 111; 2V = 71 38'. 



B.B. Fuses easily with intumescence, yielding a green flame 

 (boron). Gelatinizes with HC1 after fusion, but insoluble before. 

 May yield an iron or manganese reaction with the fluxes. 



FIG. 495. Axinite from Dauphine, France. 



General description. Crystals flattened, with the forms r, 

 M, and m prominent, with edges sharp like an axe, hence the name 



