*LAUBEIUTE, A NEW MINERAL. 



65 



TABLE III. 



Th. 



Cor. 



Th 



Cor. 



Th. 



Cor. 



82 



126 



59 



68 



45 



32 



72 



101 



53 



65 



44 



29 



71 



93 



57 



62 



43 



27 



70 



96 



56 



60 



42 



24 



69 



93 



55 



57 



41 



22 



6s 



91 



54 



54 



40 



19 



67 



88 



53 



52 



39 



17 



66 



86 



52 



4J 



38 



14 



65 



83 



51 



47 



37 



12 



64 



80 



50 



44 



36 



10 



63 



78 



49 



42 



35 



7 



62 



75 



48 



3i) 



34 



5 



61 



73 



47 



37 



83 



2 



60 



70 



46 



34 



32 



— 



XIV. 

 Oh the Gtauberite. By Alexander Brogniart*. 



JL HE form of the glauberite is that of an oblique prism, Figure of the 

 greatly depressed, and with a rhombic base. The angles of enseals of 

 the parallelogram of the base are 76 and 104°. The angles 

 of incidence between the parallelogram of the base and the 

 adjacent sides are 142°. That between the base and the 

 edge contiguous to the acute angle of the base is 154°. The , 

 faces of the base are generally plane, smooth, and even, 

 chining : those of the sides on the contrary are full of strise, 

 parallel to the edges of the base. Very evident juncture* 

 parallel to the base are discoverable by cleaving; as are 

 others not so well defined, parallel to the edges of the 

 base, and inclined to the former in angles of about 104°. 



These observations give as the primitive form of this crys- Primitive fbrro, 

 tal an oblique prism with a rhombic base. 



The crystals are nearly limpid, or of a topaz yellow, and Colour, 

 retain their solidity and transparency in the air, if they have 

 not been wetted. 



* Journal de Physique, vol. LXVI, p. 235. 



Voi. XXIV— Sept. 1809. F 



Th« 



