86 The Philippine Journal of Science im 



Chrysotile— H,(iMg, Fe),SiA- 



Chrysotile occurs as white to greenish silky fibers. Some in- 

 ferior specimens have been found in Ilocos Norte. Short cross 

 fibers of from 2 to 3 centimeters in length have been found. 

 There is no production, but indications are promising. 



Cinnabar — HgS. 



Minute red crystals of cinnabar were found in a few samples 

 from Batwaan Creek, Benguet, Luzon. Cinnabar remains in 

 the pan with the gold. It is reported from Mount Isarog, Am- 

 bos Camarines. This mineral forms under surface conditions, 

 and is connected with volcanic activity. It is not mined in the 

 Philippines. 



Copper — Cu (metallic). 



Native copper occurs as irregular, partly crystalline masses 

 and as round shot in alluvium; there are 3 type occurrences: (1) 

 Amygdoloids in extrusives, in Masbate; (2) in alluvials of Mala- 

 guit River, Ambos Camarines; (3) reported in some quartz veins 

 in Masbate. Native copper was probably used formerly by 

 Igorots to make pots. It is not used at present. 



Corundum — Al.,0.. 



Corundum occurs as pebbles in placers in Nueva Ecija, Luzon. 



Crocoite— PbCrO,. 



Crocoite occurs in characteristic small orange-red monoclinic 

 crystals in Labo, Paracale district, Ambos Camarines, Luzon. 

 It is associated with galena-bearing rocks, and is not abundant. 



Cuprite — Cu,0. 



Cuprite occurs as small clear red crystals in the surface ore of 

 a copper deposit in Antique Province, Panay. 



Diallage — A nonaluminous pyroxene. 



Diallage is a common constituent of gabbros in the Philip- 

 pines. It has no economic value. 



Enargite — Cu^AsS^. 



Enargite is probably secondary in copper deposits. It occurs 

 massive and in small gray crj'stals with luzonite in the old Santa 

 Barbara mine at Mancayan, Lepanto, Luzon. It is mined and 

 smelted by Igorots. Formerly there was a considerable produc- 

 tion by a Spanish company ; at present it is not important. 



Epidote— HCa, ( Al, Fe)3Si.O,,. 



Epidote is very rare. It occurs as yellowish grains or in more 



