EARTHS. CALCAREOUS, ii. Tophus. 



77 



farinacea^ Farinaceous, loofely cohering, floating, foiling the fin- 

 gers. 



Calx folubilis puipurea, Syil. nat. xii. 3. /.206. n. 2. 



Agaric ir.ineral. var- 1. Kir^ian miner. 1. p. 76. 



Soft Carbonat of lirne. VAr. 1. Thorn/on ^hem. 3 ^.608. 



Found in B'-iran and various parts, in theclefis of rockr, or the 

 bottom of lakes, or ciicareous mountains; it is fbnned of 

 more compH<^ particles, lb exceedingly briillc and reducible 

 10 dull, does not adhere to the tongue ; colour white, reddilh, 

 pr yeUowifh. 



scnj>ioria. Solid^ rough, flightly adhering tq the tongiie, without luf- 

 tre, opake, flaining the finger^, breaking into inde- 

 terminate fragments. 



Calx creta. Syji nat. xii. 3. p. 206. ;;. f. 



Cba.k Kirnxan \p-'7J. SchmeiJ^er. \. p Z\\. 



Soft Carbonat of lime. var. 2. Thomfon ckem, 3. p. 608. 



Conmon chalk, So^zvcrhy Brit.fnhier, tab 7. 



I^ound in large flrata in various parts of Britain^ Germnnf^ 

 Frar.cey and ^^njoeden, particularly on fome fca coails, often 

 containing flints and the velfigcs of echini and fiiells: colour 

 generally white, rarely greyiih : feels rither rough to the 

 touch, and {ffcrvefces Itjrongly with acids: contauis carbo- 

 nate of lime 95. alumina 2. water 3, 



Cajiil. Solid, hardifli, biittlc, a little fhining and tranfparent. 



Arenaceous limeftone. Kir^ojan miner, i.p.q^. 

 Found on the Ihores of Rhaghery^ a fpiall ifland on the coall of 

 ylntrim, and at Codrilla^ on the well fide of l^efu^v'uiSy yedow- 

 ifh-white. In the lump it cannot be eafi'y broken, but in 

 Imall pieces it fritters between the fingerj; phofphorefcet 

 when fcraped in the dark with a knife : fpccific gravity 

 2,742. contams carbonic acid 47. Kir<wan» 



(ommunis^ 



51. TOPHUS. Confining principally of carbonate 

 of lime: precipirated by water under water: po- 

 rous, without luftre. 



Depofited at the bottom of cold waters running throug}> 

 mountains and calcareous ifrata. 

 Syfi,nat. 1. p 191. xii. 3. />. l 83. «. 3. 



Stdlafiitescalcareus. Wail fy/i min. 2. p> 389. n. ro? 



Siah^ft iigura incerta. Cronji- miner fe^i, 12. i.e. 



Found in every part of the globe, fomctimes hardening, in the 

 air, fometimes mouldering, of i^umerous varieties with rcx 

 fpe6f to colour, and often iorming the firlt marijriaj of C9.1<;a* 

 reoui ftrata, 



