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MINERALOGY. i/3 



SECT. CLXX. 



9 . With fulphur and arfenict Ar gent um fulphur e 

 £<? arfenico minirnlifatum. Minera argenti 

 rubra, The redder ruby^-lflce ftlver ore. The 

 Rotbzulden of tH^tSeTmans. 



The colour of this ore varies as the pro- 

 portion of each of thefe ingredients varies 

 in the mixture ; viz. from dark grey to 

 deep red : but when it is rubbed or 

 pounded, it always gives a red colour. 

 When put in the fire, it crackles and 

 breaks •, and when the crackling ceafes, it 

 melts eafily, the arfenic at the fame time 

 exhaling in fmoke. 

 a. Grey arfenical filver ore ; which is either* 



i. Plated, crafted, or leaved, and, 



2. Solid. 

 h. The red arfenical filver ore. 



i. Plated, crafted, or leaved. 



2. Solid or fcaly, and, 



3. Criftalliled. 



In this laft fDrm it mews the mod 

 beautiful red colour, and is often 

 femi-tranfparent. It contains about 

 fixty per cent in filver \ and is found 

 in the greatefl " quantity at Andreaf- 

 berg in -the Hartz. 



SECT. CLXXI. 



3. With fulphur ted arfenic and copper, Ar- 

 gentum arfenico & cupro fulphurato minera* 

 lifatum. Minera argenti aibi, The Weiff- 

 gulden of the Germans. 



This, in its folic! form, is of a light grey 

 colour, and of a dull and fteel-grained tex- 

 ture. 



