XI, A, 5 



Witt: Philippine Paving-brick Materials 



217 



The geologic collection of the Bureau of Science contains many 

 samples of clays and shales. Recently I have looked over these 

 samples in a search for suitable paving-brick materials. The 

 ones that show a lack of plasticity, or are too high in carbonates, 

 have been given no further consideration. On other samples as 

 much material as could be removed without destroying the speci- 

 mens was taken and made into pats. Some idea of the working 

 and drying qualities of the clays was obtained from these. 

 Several of the more satisfactory pats were placed in a kiln to 

 obtain some idea of their burning qualities. A list of the clays 

 represented by these specimens and the locations of deposits as 

 accurately as is known are given in Table VI. An effort will be 

 made to obtain larger samples of the favorable materials. 



Table VI. — Samples of cl 



ys and shales in Bureau of Science geologic 

 collection. 



[This includes only those which are plastic and which contain no carbonates.] 



Location of deposit. 



Town and province. 



Additional informa- 

 tion. 



Material. 



Appearance of raw- probable value, 

 clay test pieces. i">j<»v.''<= va.uc. 



Batan. Batan Is- 

 land. 



San Jose, Camarines. 



Colasi, Antique 



Antique Province .. 

 Los BaiioB, Laguna. 

 Angat, Bulacan 



Entry No. 2, Bett's 

 claim, between coal 

 seams. 



River north of Sa- 

 bang. 



Haralison Island 



Do 



Surigao Province 



Isabela Province 



Tagonton, Camarines. 

 Magalang, Fampanga. 

 Paracale, Camarines-. 



Nagcarlang, Laguna . 



Bucay, Abra 



Mindoro Province 



Maon Creek, pyrite 

 veins. 



Mayapo 



Eugenie's house 



Cagayan Nuevo mine. 

 San Mauricio mine .-. 



San Agustin 



Trinidad mine 



Batac, Ilocos Norte,.. 

 La Union Province... 

 Nasugbu, Batangas .. 

 Matiquio, Laguna 



Cruz Mountains . 

 East of town 



Shale . 



.do. 



Kaolin- 

 ....do .. 

 ...do.. 



Clay ... 



....do . 

 Shale.. 

 Clay ... 

 Kaolin. 

 Clay ... 

 Kaolin. 



Clay ... 

 Kaolin. 

 Clay ... 



...do . 

 Shale . 

 Clay.. 

 ...do . 



Gray 



Light brown, no 

 strength. 



Gray, no strength 



do 



White, no strength... 

 Gray 



Fair.c 



Possible.": 



Alphonso, Palawan.. 



Manito, Albay 



Magpog, Mindoro 



° Vitrified below cone 7. 



Balabac Island 



do 



___.do 



Kaolin 



*> Fused below cone 7. 



White, no strength... 



Brown 



White, no strength... 



do 



do 



Light brown, no 



strength. 



Light brown 



White, little strength . 

 Light brown, little 



strength. 



do 



Brown 



White, no strength... 

 Light gray, little 



strength. 



Reddish brown 



Gray 



White, little strength, 



■= Did not vitrify below cone 7, 



Very good." 



Fair. 



Fair.a 



Fair.<: 

 Possible.": 



