47 



Which is most common, granite or sienite ? 



What other rocks except granite, are more common 

 than sienite? 



What are the ingredients in greenstone? and which 

 predominates ? 



Where are extensive deposits of greenstone ? Is it a 

 heavy or light rock? hard or soft? easy or difficult to 

 break? 



What rock composes Mount Holyoke and Mount 

 Tom? 



What rock abounds at New Haven, Connecticut, and 

 in Edinburgh, Scotland? 



When sandstone is found in connexion with green- 

 stone, is it placed above or below it? 



Of what is sandstone composed? 



What place has furnished sandstone, sometimes called 

 freestone, as a building material for most of the cities 

 and large towns in the Union? 



What rock besides sandstone, is composed of grains 

 and pebbles cemented? 



In deposits of graywacke, which is coarsest, the 

 highest or lowest part of the mass ? 



What rock abounds between Boston and Providence? 



What is the common name for argillite, and to what 

 uses is it applied? 



From what place is it obtained? 



Has it been wrought from quarries in this country ? 

 and where? 



Is limestone an ancient or modern rock, or both? 



Which is coarsest, the most ancient or most recent ? 



Are the varieties of limestone few or numerous? 



To what stratum of rocks do marbles belong, lime or 

 porphyry ? 



To what does chalk belong ? 



Where is gypsum found ? 



What is the name of that variety of gypsum which 

 resembles mica? 



Which is most elastic, mica or selenite ? 



What is the most important use of gypsum? 



What plant is most benefited by it as a manure? 



For what purposes in the arts except agriculture, is 

 gypsum used ? 



