218 



The Philippine Journal of Science 



1916 



Table VI. — Samples of clays and shales in Bureau of Science geologic 

 collection — Continued. 



Location of deposit. 



Town and province. 



Additional informa- 

 tion. 



Material. 



Appearance of raw- 

 clay test pieces. 



Probable value, 



Los Baiios, Laguna--. 



Santa Mesa, Rizal 



Bulalacao, Mindoro... 

 Bannangan, Benguet. 



Los Bafios, Laguna... 

 San Remigio, Antique. 



Compostela, Cebu 



Tiwi, Albay 



Bataan Province 



Cebu Province 



San Fernando, Capiz, 



Sibuyan. 

 Los Baiios, Laguna... 



Baguio, Mountain 



Baraaoto, Sabagan, 



Mountain. 

 Placer, Surigao 



Alpha mine 



Pasig River 



Mahohao River 



First hills on road to 

 Baguio. 



Cotcot River 



Tigaboc 



Trail between San 

 Jose and Mariveles; 

 elevation, 106 me- 

 ters. 



Near Baliana 



Mabolo 



Kelly's mine 



Outcrop along trail. 



Lagondola 



Clay.. 

 ....do . 

 Shale . 

 Clay .. 



Kaolin - 

 Clay ... 

 Shale.. 

 Kaolin. 

 Clay ... 



Shale... 

 Kaolin. - 



Clay .. 

 ...do . 

 Shale . 



Kaolin 



White, little strength. 



Gray 



Very dark gray 



Light brown, little 

 strength. 



do 



Gray 



Brown 



White, no strength... 

 Gray, little strength . 



do 



Gray, no strength 



White, no strength... 

 Gray, little strength . 

 Gray, fair strength . . 



White, very good 

 strength. 



Very good.a 

 Very good. 



Very good.b 

 Fair.c 



Possible. 



Possible. 

 Fair. 



» Vitrified below cone 7. •> Fused below cone 7. ' Did not vitrify below cone 7. 



BONDING QUALITIES OF PASIG CLAY 



There is a large tuff quarry not far from the clay deposit on 

 Pasig River (clay 2), and it was decided to investigate the pro- 

 perties of mixtures of the clay with pulverized tuff. The clay is 

 not satisfactory for paving brick when used alone, but it seemed 

 probable that the mixture of the two substances might be satis- 

 factory. A large sample of the tuff was secured and ground to 

 about 20 mesh. Some of the Pasig clay was dried and ground 

 to the same fineness. The two were mixed in various proportions 

 and from each mixture tensile-strength briquettes and some 

 experimental bricks for fire test were made. Mixtures contain- 

 ing up to 70 per cent tuff exhibited very satisfactory working and 

 drying qualities. The average tensile strengths of the various 

 mixtures is shown in Table VII. All the briquettes were made 

 in the same manner and carried through in parallel until broken. 



