Calcareous Genus. 45 



three ; its hardnefs not fo great as to give 

 fire with fteel. 



It is foluble with effervefcence in acids, but 

 its moft diftindive character is the offenfive 

 urinous fmell it gives when rubbed : it lofes 

 this fmell when heated fuffieiently, and gives 

 a flight flame when furrounded with burning 

 coals, and at laft burns to lime. 



It affords little or no oil by diftillation. 



It frequently contains a little argillaceous 

 Earth and Iron, and moulders by expofure 

 to the air. 



SPECIES X. 



Mild Calcareous Earth mixed 'with a notable 

 Proportion of Pyrites. 



Pyrltaceous Llmeftone> Pierre de Sf. Ambrolx. 



This ftone was analyfed by Baron Servieres^ 

 21 Roz. 394. 22 Roz. 207. Its colour is 

 iron grey, interfperfed with fhining particles. 

 Its texture compact 5 its hardnefs fuch as 

 fcarcely to give fire with fteel 5 its fpecific 

 gravity 2,7034. 



It is foluble in acids, and moflly with effer- 

 vefcence. 



It 



