On Crystallography. 6*5 



Names of the Substances. Form of the integrant Molecule. 



Tourmaline Irregular tetrahedron 



Chabasie Rhomboidal 



Dioptase Ditto 



Sulphurated antimoniated 



silver Rhomboidal. 



** With acute summits. 



Corundum Rhomboidal 



Oligistous iron Ditto 



Sulphurated iron Ditto. 



2. OCTAHEDRON. 



* Pyramids with square bases. 



Alkaline filiated alumine . . Irregular tetrahedron 



Zircon Ditto 



Harmotome Ditto 



Anatase Ditto 



Molybdated lead ......... Ditto 



Mellite Ditto. 



** Pyramids with rectangular bases. 



Nitrated potash Irregular tetrahedron 



Carbonated lead Ditto 



Sulphated lead Ditto 



Oxidated zinc Ditto. 



*** Pyramids with rhombic bases. 



Sulphur Irregular tetrahedron 



Red sulphurated arsenic . . . Irregular tetrahedron. 

 Blue carbonated copper . . . Ditto. 



3. TETRAHEDRAL PRISM. 

 1. STRAIGHT PRISM. 



* With square bases, 



Sulphated magnesia Isosceles-rectangle-triangular 



prism 



Idocrase Ditto 



Meionite ♦ . . . . Prism with square bases 



Wernerite Ditto 



Mesotype Isosceles-rectangle, triangular 



prism 

 Chromated lead Ditto 



Vol. 36. No. 147. July 1810. E Oxidated 



