82 Armenian Bole, &t. [Book VI. 



irregular fcaly pieces. This is the fuller's earth ufed 

 in the drefling of cloths. To this fpecies alfo belongs 

 the terra lemnia; this is of a brownifh colour and 

 ill in ing texture, and falls to pieces in water with a 

 crackling noife. The terra lemnia is fo called from 

 the ifland of Lemnos, now Statimane, in the JEgean 

 fea, whence it is procured. It is likevvife called the 

 Turkifh earth, on account of its being impreiTed with 

 the leal of the grand fignior. 



IV. BOLE is a fine and denfe clay of various colours, 

 containing a large quantity of iron. It is not eafily 

 fottened in water when indurated, as the porcelain and 

 common clays, but either falls to pieces in the form of 

 fine grains, or repels the water, and cannot be made 

 ductile. In the fire it grows black, and is then at- 

 trafted by the loaddone. The foft boles are of va- 

 rious colours, as red, yellow, green, grey, and blueifh 

 grey. The red kind is that uled in medicine, under 

 the name of Armenian bole; an indurated kind of 

 which affords the material for red pencils. An indu- 

 rated bole is frequently found in coal-pits, between 

 the feams of coal, and is called coal flate. It is met 

 with frequently in pieces like nuts of various fizes ; 

 \vhich when broken exhibit imprefilons of plants, as 

 the nodules of copper- flate from Ilmenaus contain 

 representations of fiih. A fpecies of bole is found with 

 fcaly particles, the hornblende of die Swedes. It is 

 cllftinguimed from mica, by the fcales being lefs min- 

 ing, thicker, and rectangular. It is frequentlyanixed 

 with pyrites ; it is of two kinds, black and greem'ih. 

 The former, when rubbed fine, , alibi ds a green 

 powder, and is either of a lamellated or granular tex- 

 ture. The greeniih kind is of a granular texture, or 

 flriated. ' 



V. ZEOLITE 



