PHYSIOGRAPHY. 



Bucklandite Bustamite. 



93 



3. The distinctly crystallized variety, or Sillimanite, occurs in veins 

 >f Quartz at Chester, (Conn.) in a quarry of gneiss. The compactly 

 ibrous variety was discovered originally in the Tyrol. It exists in the 

 United States, at Chester, (Penn.) near Philadelphia, and at Hum- 

 jhreysville, (Conn.) 



BUCKLANDITE. 



Primary form. Oblique rhombic prism ? M on M 109 20'. 



Secondary form. 



Fig. 79. 

 on M or M' ... 103 56' 



MonM' 



VI on p ... 



on p ... 



on e ... 



o on o ... 



M on e' ... 



Cleavage not observable. Color dark brown, nearly black. 

 Opake. It appears to be harder than Pyroxene. 



1. It was discovered in small crystals on a specimen from Neskiel 

 mine, near Arendal in Norway, where it occurs with black Hornblende, 

 Scapolite. and Calcareous Spar. It resembles Pyroxene. 



2. It is not sufficiently described to settle the question of its specific 

 character, t 



BUSTAMITE. Staphyline Parachrose-Baryte. 



Massive : in reniform and botryoidal groupes. 



Color, light grey, passing into a greenish or reddish 

 color. Nearly opake. 



Hardness = 6-0 . . . 6-5. Sp. gr. = 3-1 ... 3-3, 



1. Analysis. 



By DUMAS. 



Silica .... 48-90 



Protoxide of manganese . . 36-06 



Lime .... 14-57 



Protoxide of iron .... 0-81 



