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 in the sedimentary kaolins which occur in 
this general region. Mica is also present in small amounts. If washed, 
this clay would be suitable for some grades of white ware. The high 
porosity listed below is due to small cracks which developed in the test 
pieces during firing. 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. 
Water 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: 
mperature. Linear Shr. 
Per Cent. 
Absorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
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-burning clay 
sent in by Mr. 
Lloyd from Sec 
8 S., R. 
23 E., has a 
much greater percentage of sand and mica. 
has the following physical properties : 
Physical Properties of Lloyd Sandy White Clay (Lab. No. 0 - 65 ). 
Poor. 
Plasticity, judged by feel. 
Water of plasticity .. 18.30% 
Pore water. 
Shrinkage water. 
Linear air shrinkage. 
Modulus of rupture, average. 
Slaking test. 2 minutes. 
Fire tests: 
0.30% 
18.00% 
2.5% 
73.0 pounds per square inch. 
1 perature. 
Linear Shr. 
Per Cent. 
A bsorption. 
Per Cent. 
Porosity. 
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. 
Color. 
