On the Analyses of the Chromate of Irony &c, 223 



The abracum is prepared from white mica,, by repeated 

 grindings, the finer particles being removed iior use by wash- 

 ing them from the grosser parts. 



The wall, when finished in this manner, shines hke the 

 scales of a fish ; and when the room is lighted has a splendid 

 appearance: but in the day-time, the wall washed with the 

 powdered potstone alone, in my opinion, looks better ihaa 

 when waslied with either quick-lime or mica. 



XLV. Notice ztpon the jlvahjses of the ChrtMate of Irouy 

 and. iLpon the Fariety of ike Epidote called Zmjsile. By 

 Ji. Haoy*. 



-iVI. Laugier has published in a former number of these 

 Aiinales t, the result of the analysis he made of the chro- 

 mate of iron of Siberia, and this result was similar to that 

 obtained by M. Vauquelin, when examining the chromate 

 of iron discovered by M. Pontier in the department o^* 

 Var. M, Klaproth lately repeated the analysis of the sanie 

 substance upon a piece which came from Krieglach, in 

 Styria ; and his results having been communicated to M^ 

 Laugier, we now insert it, as presenting a confirma,tion o£ 

 the two preceding analyses. 



KLAPROTH. LAUGIER. rAUQUELIX. 



Chromate of Iron of Styria. • Chromate of Siberia. Chromate of Van 



Oxide of chrome 55'5 53 43 



Oxide of iron - - 33 34 34'T 



Alumina - - - ^ . H 0Q.3. 



Silex - - - - 2 1 2 



O 







Waste by roasting * 2 



Loss - - _ 



100 100 100 



We find in a subsequent number the result of another 

 analysis made by M. Laugier upon a grayish substance- 



• From Annales du Musmm d^Uisioire, tome ix. p, 103. 

 f See Phil. Mag, vol. xriv. p. 3 



brought 



