1? CONTENTS. 
F 
Introduction — The Occurrence of Granite in Maine, by George 
Otis Smith. 
Page. 
Geographic distribution 7 
Geologic relations 9 
Scope of this report ■ 11 
Importance of the industry 12 
The Granites of Maine, by T. Nelson Da.le. 
Introduction 13 
Part I. Scientific discussion 14 
Granite proper 14 
Granite in general 14 
Definition 14 
Origin 14 
Mineralogical composition 16 
Chemical composition 18 
Texture 20 
Definition 20 
Character and grade 20 
Forms of minerals 20 
Arrangement of minerals 20 
Physical properties 21 
Weight 21 
Cohesiveness 21 
Elasticity . . ! 21 
Flexibility 22 
Hardness 22 
Expansibility 22 
Porosity 22 
Vitreousness 23 
Classification 23 
Scientific classification 23 
Economic classification 24 
Maine granites 24 
Classification 24 
General structure 25 
Flow structure 25 
Rift and grain 26 
Sheets 30 
Joints 38 
Headings 39 
Faults 40 
Microscopic fractures ( ' ' shakes " ) - 40 
Subjoints 41 
Contemporary fractures - 42 
3 
