EARTHS. AROILLACEOUS. 31. ArgiUa, 11 ■ 



Cimdia, Pearl grey, becoming reddifh when expofcd to the air,. 



adherini^ Itrongly to ihe tungiie, not (taining, becom- 



in<: white before ihc blow-pipe. 

 Cimolite. 1 horruhn chcm, 3. p. 536. 

 Found in ih-! \^<. o^. Jhientkn^ in i\\Q JrcbipeUgo, where it is 



ufed for vvhi ening llaffs : texture earthy, fradlu re uneven, 



opake, foft, breaking with difliculty : fpecific gravity 2,occ. 



contains iilica 63,00. alumina 23,00. iron ij-5. water 



12,00. Klaproth. 



sinensis. Rather meai/ re to the touch, rufous varieojated with ochra- 

 ceobs dots and fpois, foftening in water, 



Ar«:iila iiaveicens. $■)'!}. nat. xii. 3 p. 201. 11. \. 



Poliershiefcr. T^hotnfon chem. 3./. 5 "7? 



Found near Montmarte in France, antl in China, where it confli- 

 tutes the fvil upon which cotton, rice and indigo are cul'i- 

 vated : it is ufed in the making of bricks which are intenricd 

 to be under water, 



Ruhrica. Soft, Gaining, adhering to the tongue, red, brittlf^, dovS 

 not become dudile in water, of an earthy texture. 



T;^!cuni hhfiffile. Syfi. nat, xii. 3. /. 5 ' , n. 3. 



Ochra ferri rubra". WiJLjvft. tnin, z. p. 260, n. 22. c. 



Red. Reddle Kirnx:an irAner:d \.p. 193. 



Found in Sihria-, balecania, Bohemia,^ Portugal, and France, 

 generally among iron ore, with whicn it co.nmonly abounds : 

 colour dark cochinelle red, or intermediate between brick ard 

 blood red: fracture earthy, lornetiiTies conchoidal : teels 

 rough, allume.s a ^iolifh from the nail, ftrongly ftains the iir.~ 

 gers, adheres to the tong;ue, falls immediately to powder in 

 water, does not efFervcfce nor eafily difiblve in acids, crackles 

 and grows black when heated ^o rednels, and melts at lallinto 

 a dark greenifh-yellow frothy enamel. 



luter^ Veryfoft, ftaining the fmgers, adhering to the tongue, 



ochre yellow. 

 Gelbe erde. Ho^mann Berg. 'Joiirn. 1788. ^.521. 

 Yellow ochre. Kir'^ajan inimral. \.p. 194. 

 I Found near Wehrau: fecii> fmooth orfomewhat grcafy : fnidlure 

 earthy, or inclming to the conch idal : adheres ilrongly to 

 the tongue, takes a high polifli from the nail, and ftrongly 

 flains the fingers: falls immediately to pieces in water, wich 

 fome liiiling, afterward^ to powder, but does not dinufe it- 

 felf through it: does not effervefce with acids, or eafily dil- 

 Iblve in them : heated to rediicfs it crackles, hardens, ac-; 

 quires a red colour, and gives a reddifh ilreak, and melts at 

 lail into a liver-brown porcelain mafs : contains alumina 

 50. oxyde of iron 40, water acidulated by fulphuric acid 

 10, 



