SI1NERAL0GY. 21 



ces, or Burmah; alKthe flints that are used being imported 

 from Bengal. 



COMMON CHALCEDONY. 



Chalcedony, both white and yellow, has been discover- 

 ed at Moopoon near Maulmain, and is very abundant in 

 Burmah. " Chalcedony passes insensibly into agate, and 

 carnelian, and perhaps into hornstone." 



Qo^cpJ^n white. Gc^Gpolu yellow 



CACHOLONG, 



Streaks of cacholong, or milk white chalcedony, are 

 seen on some of the agates. 



SARD. 



" This is of a deep rich, reddish brown color, probably 

 a variety of carnelian," but by some regarded as a variety 

 of chalcedony, and is seen occasionally as constituting a 

 part of some of the agates offered for sale- 



ONYX. 



Mineralogists are not agreed in the definition of onyx. 

 According to Comstock, it is a 'variety of chalcedony, 

 " consisting of alternate layers of opake milk-white chal- 

 cedony, or cacholong, and of the bluish translucent chal- 

 cedony," — the chalcedonyx of Jameson. Such are found 

 at Moopoon. 



o cq cp Q coqp So 6 n 



Aiken says : " Two or more plates of any of the varieties 

 of the chalcedony form the onyx." Such are found in 

 Burmah, if not in the Provinces. 



oo^cpGoqp£oSn * 



SARDONYX. 



According to Comstock, sardonyx consists of stripes of 



