132 FLORIDA GEOLOGICAL SURVEY-15TH ANNUAL REPORT


 Another clay sent in by Mr. Lloyd from Sec. 2, T. 8 S., R. 23 E., contains much coarse, sharp angular quartz sand, but the sand content is not nearly so high as is the case :n the sedimentary kaolins which occur in this general region. Mica is also present in small amounts. If washe:l1, this clay would be suitable for some grades of white ware. The high porosity listed below is due to small cracks NVhich developed in the test pieces during firng. A sample of the crude clay has the following physical properties:
 Physical Properties of Lloyd White Clay (Lab. No. o-66).
 Plasticity, judged by feel ............ Excellent.
 W ater of plasticity ................ 21.50%
 Pore water ........................ 2.85%
 Shrinkage water ................... 18.65%
 Linear air shrinkage................ 9.3%
 Modulus of rupture, average ........ 120.4 pounds per square inch.
 Slaking test ....................... 3 days.
 Steel hard at cone 9.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950*C. 3.2 32.07 48.80 White.
 1050. 3.7 32.97 48.75 White.
 1150 3.2 29.67 45.10 White.
 1190 3.2 29.60 46.00 White.
 1230 3.7 30.09 45.65 White.
 1310 8.7 19.60 37.10 White.
 1370 12.2 12.53 28.75 White.
 1410 14.7 9.38 21.20 White.


 Still another white-burnng clay sent in by Mr. Lloyd from Sec. 2, T. 8 S., R. 23 E., has a much greater percentage of sand and mica. It
has the following physical properties:

 Physical Properties of Lloyd Sandy White Clay (Lab. No. o-65).
 Plasticity, judged by feel............ Poor.
 W ater of plasticity ................ 18.30%
 Pore water ........................ 0.30%
 Shrinkage water ................... 18.00%
 Linear air shrinkage................ 2.5%
 Modulus of rupture, average........ 73.0 pounds per square inch.
 Slaking test ....................... 2 minutes.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950'C. 0.2 17.90 37.50 White.
 1050 1.5 17.04 37.60 White.
 1150 1.5 17.49 37.20 White.
 1190 1.5 16.90 35.25 White.
 1230 2.0 16.85 32.60 White.