317 



APPENDIX. 



ALBITE. 



Very distinct^ crystals of this species are found at Williamstown, 

 (Mass.,) where it is associated with Dolomite ?. Some of the crystals 

 arc three quarters of an inch in diameter, and highly transparent. They 

 are pretty constantly twin-crystals, and very much modified. A similar 

 variety is also found at Middletown, occupying druses in a coarse 

 grained granite, consisting chiefly of Feldspar. The crystals at the last 

 Mentioned place are invariably compound. 



ALLANITE. (See Vol.. I. p. 6.) 



The variety from Iglorsoit in Greenland, has a sp. gr. 3-44P. Be- 

 fore the blow-pipe, it swells up on first feeling the heat, but on contin- 

 uing the heat, it melts into a black and very brittle vitreous pearl, which, 

 while it is hot, exhibits a honey yellow color, and becomes greenish 

 yellow when cold. The mineral gelatinizes in nitric, as well as in mu- 

 riatic acid. According to STROMEYER, it contains 



Silica 33-021 



Alumina 15226 



Protoxide of cerium 21600 



Protoxide of iron 15-101 



Protoxide of manganese ----- 0-404 



Lime 11-080 



Water - - - - - - 3-000 



ALUMOCALCITE. 



Massive. Color Milk- white, inclining to blue. Fracture conchoidal. 

 Small fragments may be rubbed to pieces between the fingers. Sp. gr. 

 = 2-174. Adheres strongly to the tongue. 



It yields water in the glass tube, and becomes opake and grey colored 

 when exposed to heat in the platina forceps. With borax, it forms a 

 colorless glass. It is soluble in salt of phosphorus, with the exception of 

 a silica-skeleton. In concentrated muriatic acid, it forms a transparent 

 jelly. KERSTE.V found it tp consist of 

 27* 



