this mo t- rial , and although no Important quarries have 
been located there can be little question that such 
exist* Among the most remarkable chipped implements 
in America and in the world 
are the 
obsidian knives of California, the largest of which are 
upwards of two feet in length and at the same time are 
{ 3 ) 
of remarkable symmetry and. beauty of finish. * It is 
A 
an especially noteworthy .fact that the art of working 
obsidian is practised successfully as a matter of gain 
today by certain California Indian:,,, sokmen fa 
Obsidian was quarried extensively in Mexico, and 
the best known mines are found in one state of Hidalgo 
about twelve miles northeast of 1dm mining city of Pachuca 
and on the mountain known as Sierra cle las Havanas or the 
” Mountain of Knives * !t 
