198 
FLORIDA GEOLOGICAL SURVEY-I 5 TH ANNUAL REPORT 
Fire tests: 
Temperature. 
Linear Shr. 
Per Cent. 
A bsorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
950°C. 
0.2 
12.26 
30.40 
Brick red. 
1050 
0.3 
13.92 
30.60 
Brick red. 
1150 
0.3 
12.55 
28.00 
Brick red. 
1190 
0.3 
11.60 
26.00 
Brick red. 
1230 
1.3 
10.83 
26.40 
Brick red. 
1310 
11.50 
28.60 
Brick red. 
1370 
11.01 
28.00 
Brick red. 
1430 
8.19 
19.10 
Brick red. 
The old Herman Brown brick plant was located on Rice Creek, 
about three miles southwest of Rice Creek Station in Sec. 16, T. 9 S., 
R. 26 E. Common brick, hollow block and drain tile were produced. 
This deposit is located three miles west of the Atlantic Coast Line Rail¬ 
road and two miles north of the Georgia Southern and Florida Rail¬ 
road. The abandoned plant was located on the bank of the creek which 
offers water transportation facilities to Jacksonville and other points on 
the St. Johns River. 
The clay is twelve feet thick, underlain by sand and has an over¬ 
burden of about one foot of soil. The exact extent of this deposit is not 
known, but more than forty acres are known to be underlain by it. 
A vitrified product cannot be produced, but this clay is suitable for 
the manufacture of a good grade of structural materials. Its physical 
properties are: 
Physical Properties of Herman Brown Clay, Rice Creek (Lab. No. 0 - 62 ). 
Plasticity, judged by feel... 
Water of plasticity. 
Pore water. 
Shrinkage water . 
Linear air shrinkage. 
Volume fire shrinkage. 
Modulus of rupture, average 
Slaking test. 
Excellent. 
22.25% 
1.32% 
20.93% 
10.0 % 
26.45% 
546.2 pounds per square inch. 
3 hours. 
