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MINERALOGY. 



[Sect VIII 



Sec 



of the class silicates. They nevertheless, for the most part, possess 

 a peculiar colour, guiding us in their study ; their specific gravity 

 is generally high, and almost all upon assay immediately give a 

 regulus or metallic scoria. 



Genus» 



XXXV. Cerium, 

 XXXVI, Manganese, 

 XXXVII, Iron, 

 XXXVIII, Cobalt, 



XXXIX, Nickel. 

 XL, Zinc. 



Gonus. 



XLi, Cadmium, 

 XLii, Lead. 

 xi.iii. Tin, 

 XLiv. Bismuth. 



XLV. Uranium. 

 XLvi. Copper. 



Fifth ChAss.— Silicates. 



Genus. 



XLVII, Silver, 



XLviii. Gold. 



XLix. Platinum, 

 L. Iridium, 

 LI. Palladium 



The 



long known especially as stones. They form two distinct groups 

 the hydrous and the anhydrous silicates : the first are soft, and 

 easily dissolve in acids ; the second are hard ; a portion with diffi- 

 culty soluble in acids ; the greater part insoluble in them. 

 The specific gravity of the silicates :'s between 2'5 and 3-6; a small 

 number only approaching the latter limit. 



Genus. 



Lii. Aluminous silicates. 

 Liii. Hydrated aluminous sili- 



cates. 



Liv. Silicates of aluminaj of 



lime, or their isomorphic 

 substances. 



LV, Aluminous and alkaline 



silicates, and their iso- 

 morphic substances. 



Genus, 



and their isomorphic sub- 

 stances. 

 Lvii, Non-aluminous silicates, 

 LTiii. Silico-aluminaies, 

 JAX. Silico-fluates. 

 Lx. Silico-borates. 

 Lxi. Silico-titanates, 

 Lxii. Silicc-sulphurets. 

 Lxm. Aluminates. 



Lvi. Aluminous hydrated sili- j lxiv. Substances of unknown 



cates, with alkalies, lime, 



* ^ « 



composition. 



Sixth Cj^Ass.—Combiistibles. 



The mineral constituting this class for the most part still present 

 traces of their organic origin; when crystallization has, as m 

 wellite, effaced this essential character, we are reminded of it bv the 

 nature of the elements which enter into the composition of the 

 mineral. 



The combustibles of organic origin generally bum with flame at a 

 moderate temperature, giving out a marked odour. They are soft ; 

 their specific gravity, generally very low, does not exceed 1 • 6. 



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