TEXTURE OF IGNEOUS ROCKS 707 



fabric is found to recur frequently, it may be given a specific name, 

 which may possess more or less elasticity, according to the definiteness 

 of the description to which it has been applied. 



It will be observed that the foregoing discussion is confined 

 almost wholly to general features of textures, and that the terms 

 suggested have a general appHcation. They contribute to the general 

 descriptive equipment of petrography. The specific description of 

 a definite rock texture must of necessity be a complex expression, 

 which, if needed frequently for other rocks, may be represented by a 

 denotive term, derived from a geographical name, with the termina- 

 tion a/, as suggested in our essay on a Quantitative Classification of 

 Igneous Rocks. ^ 



I This Journal, Vol. X (1902), p. 635. 



