70 PHYSIOGRAPHY. 



ALUMINITE. 



Aluminite. JAM. Syst. Vol. II. p. 55. Man. p. 314. Alu- 

 minite. PHILL. p. 145. 



Reniform, massive : composition impalpable. Sur- 

 face dull. Fracture fine grained and earthy. 

 Friable. 



Colour white. Streak white, a little glimmering. 

 It soils. Opake. 



Sp.'Gr. = 1-669, SCHEEBEB. 



It is difficultly fusible. In acids it is readily dissolved, 

 and does not effervesce. It imbibes water, but does not 

 fall into pieces. According to STROMEYEK, it consists of 



from Halle, from Netvha-ven. 

 Alumina 30-262 29-868. 



Sulphuric Acid 23-365 23-270. 



Water 46-327 46-762. 



It occurs at Halle on the Saale in Prussia, in beds of 

 plastic clay, and also near Newhaven in Sussex in lime- 

 stone. 



AMBLYGONITE. 



SPAR. 



Amblygonite. JAM. Syst. Vol. III. p. 532. Man. p. 316. 

 Amblygonite. PHILL. p. 198. 



Prismatic. P + oo = 106 10'. Cleavage, P + OD. 

 Fracture uneven. 



Lustre vitreous, inclining to pearly. Colour green- 

 ish-white, passing into light mountain- and celan- 

 dine-green. Streak white. Semi-transparent , . . 

 translucent. 



Hardness = 6-0, BREITHAUPT. Sp. Gr. = 3-00 

 ... 3'04<, BREITHAUPT. 



