139 



TAB. CLXXIV. 



CALX carbonata; var. radiata. 



Madreporite ? or Radiated Carbonate of Lime. 



Div. 2. Imitative. 



Syn. Madrepor-stein. Journal des Mines, n. 47. 

 p. 831. 

 Madreporite. Haiiy, 4. 378. 



When I gathered this specimen, which seemed to have 

 fallen from the rock at Bow-and-Arrow Castle, on the Isle 

 of Portland, I was instigated to keep it as of an uncommon 

 construction, to serve as a memorandum of the place, and 

 to recall to my memory the nature of that part of my ex- 

 cursion. This sort of relic, though sometimes not very 

 handsome, is nevertheless pleasing; and it is a continual 

 enjoyment of a pleasure to be reminded of it. 



This has been rendered of more consequence, since it is 

 a curious example of the utility of the knowledge of crys- 

 tallization, which in this case distinguishes it from a coral ; 

 and might have made the substance called Madreporite 

 better understood. It is said, " the Madreporite belonging 

 to the class of calcareous stones, found by M. de Molle 

 some years ago at Russbachthall, in the county of Salz- 

 bourg, is a stone of transportation. Some specimens 

 weigh from twenty to thirty pounds. " 



" Externally it resembles Basaltes, so much, that some 

 Mineralogists considered it to be the same; others believed 



