26 



A small degree of heat would melt it, if it were Pitch. 

 This is a sort of proof of a natural application of a che- 

 mical trial necessary in Mineralogy. 



The ochraceous part at first sight resembles a parcel of 

 leaves from a chalybeate spring, and is of as deep an 

 orange-colour as any I have seen. 



The calcareous part may be the Calx sinter of Werner, 

 which is a sort of crystallized stalactite, and the fracture is 

 more or less distinct in this specimen, as well internally as 

 externally. It seems to have been formed after the Iron, 

 by nearly the same process, but was retained longer by the 

 water. 



