84 A SYSTEM OF 



S E C T. LXXVI. 



Observation on the Garnet Kind. 



When this kind contains fo much of iron as 

 tenders it profitable to be worked, it is confidered 

 as a good iron ore, and no notice is taken of its 

 ■natural character, in the fame manner as is done 

 with clays and jafpers that contain iron : for the 

 richnefs of metal in thcle rifes in a gradual pro- 

 greffion; until they acquire the colour and ap- 

 pearance of the iron itfelf; 



Thus a kind of garnet is melted in a furnace, 

 not far from Eibenftock, in Saxony, and the 

 fame fpeeies is found, and might alfo be em- 

 ployed at Moren, in Weftmanland. Jafpers are 

 for this purpofe melted in Hungary, and clays in 

 England j but as the greatefl part of the garnet 

 kind contains fo little iron as to yield only be- 

 tween fix and twelve per cent, which is too poor 

 to be v/orked any where in the world as a profita- 

 ble iron ore, the reft and the greatefl part of it 

 being a mere earth, it mult in a natural hiftory be 

 confidered and ranked among the earths. 



The tin grains mould have got a place in this or- 

 der, i. If I had known any of them to contain tin in 

 fo imall a portion as five per cent, as this quan- 

 tity of tin is the moil that ever can be obtained 

 from the garnets •, 2. if it was proved that a calx 

 of iron always was mixed with it, as in the 

 garnet j and, 3. If I did not believe that the 



The Engltfh mineral name of Call, has hern ufed bv feme authors as fy- 

 nnnymous with cockle?, and is even confounded together at the mines; but 

 the Call, definitely fpeaking, isthefubftar.ee railed Wolffram by the Ger- 

 mane. &c. 



Garnets, though- fmall, are often found in rrrcaoeous ftone? in England j 

 but extreme good garnets are found in great plenty alfo in like ftones in Scot- 

 land. D, C, 



tin 



