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IX. On -Crystallography. By M. Hauy. Translated 

 from the last Paris Edition of his Traite de Mineralogie. 



[Continued from vol.xxxv. p. 4GO.] 

 TABLE OF THE CRYSTALLINE FORMS. 



I. Substances tv hick have a conunon primitive form } with 



the same dimensions. 



I. CUBE. 



Names of the Substances. Form of the integrant Molecule. 



Jl$o rated magnesia Cube 



Muriated soda . . ., Ditto 



.Amphigene Irregular tetrahedron 



Analcime Cube 



Sulphurated lead Ditto 



Sulphurated iron Ditto 



Oxidated tin Ditto 



Gray cobalt Ditto 



Calcareous scheclin Regular tetrahedron. 



2. REGULAR OCTAHEDRON. 



Filiated lime Regular tetrahedron 



Muriated ammonia Ditto 



Sulphated alumine Ditto 



Spinelle Ditto 



Pleonaste Ditto 



Diamond Ditto 



Red oxidated copper Ditto : 



Oxidulated iron Ditto 



Native bismuth Ditto 



Native antimony Ditto 



3. REGULAR TETRAHEDRON. 



Pyritous copper Regular tetrahedron 



Gray copper Ditto. 



4. RHOMBOIDAL DODECAHEDRON. 



Garnet , Tetrahedron with isosceles 



triangles equal and similar 

 Sulphurated zinc Ditto. 



II. Substances the primitive forms of which only are of 

 the same kind^ with dimensions respectively peculiar to 

 each. 



) . RHOMBOID. 



* With obtuse summits. 



Carbonated lime- Rhomboid 



Tourmaline 



