APPENDIX. 



A CATALOGUE 



OF SPECIMENS OF ROCKS AND MINERALS 



ILLUSTRATING THE REPORT OF A GEOLOGICAL SURVEY 

 OF MASSACHUSETTS. 



Made by Order of the Government of the State. 



This collection, which I have made by direction of the State, and which I now 

 present to its constituted authorities, can be regarded as by no means perfect. 

 Several of the rarer and less important minerals in the State will not be found in 

 it : nor can I flatter myself that I have obtained every variety of rock that exists 

 in our limits. Yet have I done all in my power, during- the three years that have 

 been devoted to the geological survey, to procure a fair and full representation of 

 our rocks and minerals. Not improbably, however, the proprietors of some of 

 the quarries of stone in the Commonwealth, will conceive that their own are not 

 fairly represented : for in many instances I could only pr ocure such samples of the 

 rock as presented themselves to my view at the quarries. But it will be easy for 

 any who are disposed to do it, to substitute for the specimens in this collection 

 others of a better character. And I would respectfully invite all, who feel an in- 

 terest in having- this collection exhibit a fair and full collection of the mineral re- 

 sources of the State, to supply its deficiencies as they have opportunity. In gen- 

 eral I have reduced the specimens to rather a small size : always intending, how- 

 ever, that they should fairly exhibit the characters of the rock or mineral from 

 which they were broken : The great number of specimens which I was obliged to 

 collect, (one suit for the government and one for each of the colleges in the State,) 

 compelled me to consult utility almost entirely ; and hence the collection contains 

 little display of large and splendid specimens. 



The specimens in this Catalogue are arranged in the same order as the rocks are 

 described in the proceding Report. The specimens of the rocks are first giveni 

 and then those of the simple minerals which they contain. 



About 130 of the specimens have been smoothed or polished ; and this is. men- 

 tioned under each number, where such is the case. Those specimens that have 

 been only smoothed, have been varnished; and this process will need to be re- 

 newed occasionally. I found that in this way the true character of the rock could 

 be brought to light quite as distinctly as by polishing : and thus the expense was 

 considerably reduced. 



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