1826.] affecting Chemico-Mineralogical Systems. 425 



Dull manganese Mn Aq, Mn? Aq^ 



Hydrated oxide of iron , Fe- Aq», Fe» Aq 



Hydrated oxide of uranium U Aq" 



Alumina. 



Corandum Al, A 



Ahiminates. 



SpineUe M A^ 



Pleonaste i\>A^ 



Gahnite Zn A^ 



Candite M A'^ + F A^ 



Plomb-gomme Pb A^ + 6 Aq 



Gibbsite A Aq 



. F'^Aq +3A^Aq 



Diaspore j pa V '^^ 



Silica, with its varieties of crystalline forms, 

 aggregation and colours. 



n. Silicates Kith a single base. 



1 . Silicates of lime. 



. CS3 



Wollastonite » ") „ „i 



(tabular spar) J 



2. Silicaies of magnesia. 



Serpentine M S3 



Steatite M S^ + ^ Aq 



Ecumedemer M S3 + 2Aq 



PyralloUte M S^ 



Marmalite MS + Aq 



Ilydrosilicates of magnesia. 



Noble serpentine M S3 + M Aq 



Serpentine from Gullsjo Pf M Aq^ + 2 itf S* 



3. Silicate of zinc ZnS + 5 Aq 



4. Silicates of manganese. 



red MnS^ 



black Mn S + Aq 



metalloidal ? Mn' S 



5. Silicate of cerium (cerite) CeS 



6. Silicates of iron. 

 Hisingerite. 

 C'hloropliccitc. 



Cliloropal f S'> + 3 Aq 



1. Silicates of copper. 



Dioptase Cii S'^ + 2 Aq? 



Siliciferous malachite. 

 8. Silicate of zircon (zircon, hyacintli) Zr S 



* This substance so coincides in tlic directions of its cleavages' and measurements by 

 the reflective goniometer with tabular spar, that it can scarcely be said to be even a 

 variety of that substance ; and we fully agree with BIr. Phillips in hoping, " that the 

 name given to it by Leman, in honour of Dr. M'ollaston, will be abandoned, and that 

 we shall ere long find the designation of A\'ollastonite, in honour of one who has done so 

 much for almost every department of science, appropriated to some mineral of a less 

 questionable nature." (Introduction to Mineralogy, .Sd Edit. p. 21 1.) — Eil. 



t Colourless, translucid. Analysed by M. J^Iosander, 



