y 



XV. 



Outlines of the Mineralogy and Geology of Boston and its vicinity, 



with a Geological Map. 



BY J. F. DANA, M. D. & S. L. DANA, M. D. 



COMMUNICATED AUGUST 1818, 



TABULAR VIEW 



OF THE MINERALS DESCBIBED IN THIS PAPER, 



^ 





CLASS I,^EdRTHY FOSSILS. 



The minerals in this class are neither reducible to the metal- 

 lick state, nor volatilizable before the blowpipe ; it comprehends 

 two orders, viz. 



ORDER I dClDIFEROUS SUBST.iJ^CES. 



These are composed of an acid united to an earth. The gen- 

 era are founded on the peculiar earth, and the species on the par- 



ticular acid. 



GENUS l.~LIME. 



^ 



Species I. — Phosphate of Lime. 



Stihspecies L Apatite, 



IL — Carbonate of Lime, 



Subspecies I. Calcareous Spar 



Variety I. Crystallized 



S, Laminated 



4i 



II. Granular Limestone. 



'* III. Fibrous Limestone. 



St 



(£ 



€4 



IV. Compact Limestone, 

 V, Concreed Carbonate of Lime, 



VI. Brown Spar. 



i 



