SAND-LIME BRICK AND ARTIFICIAL SAND STONES IN THE 
PHILIPPINES. 
By Atvin J. Cox, W. C. REIBLING, and F. D. REYES. 
(From the Laboratory of General, Inorganic, and Physical Chemistry, 
Bureau of Science, Manila, P. I.) 
INTRODUCTION. 
Sand and limestone, although the most common and familiar 
and perhaps the least appreciated of mineral resources, constitute 
an asset of immense importance to any country. Limestone of 
excellent quality is abundant throughout the Philippine Islands + 
and guarantees to this Archipelago important industries, among 
which the manufacture of artificial stone and brick from sand 
and lime is certain to become exceedingly important. 
In the Philippines, the varieties of stone which are known to 
be good for building and construction purposes are not very 
numerous, and it is unfortunate that with the exception of a 
few deposits of voleanic tuff (“adobe” stone), those which exist 
are not conveniently located for use. In the past, most of the 
permanent buildings were constructed of volcanic tuff, and its 
low and uncertain strength? made very massive construction 
work necessary. Moreover, as the stones have a dirty color and 
are only roughly shaped by hand into rectangular blocks 18 by 
18 by 50 centimeters in size, they give structures a very unclean, 
irregular, and aged appearance. 
A superior volcanic tuff is quarried at Meycauayan, Bulacan, 
about 10 kilometers from Manila. Six-inch cubes of this ma- 
terial gave a crushing strength of 1,047 pounds per square inch 
(73.6 kilograms per square centimeter). However, the data re- 
corded in Table I show that most of the volcanic tuff extensively 
*Adams, G. I., This Journal, Sec. A (1910), 5, 57-117. Smith, W. D., 
ibid. (1906), 1, 1043-1061; Sec. A (1910), 5, 307-363. 
2 Cox, Alvin J., This Journal, Sec. A (1908), 3, 191. 
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