A PRELIMINARY REPORT ON CLAYS OE FLORIDA 
195 
buff-colored product at cones 010 and 05, and burns to a more dense 
texture and reddish color at cone 1. It fuses at cone 5. 
Several samples of the Bartow clay were examined. These indicate 
that it is very uniform in its physical properties. The following sample 
taken from one of the phosphate mines near Bartow has the following 
physical properties: 
Physical Properties of the Bartow Clay (Lab. No. 0 - 53 ). 
Plasticity, judged by feel. Fair. 
Water of plasticity. 
Pore water. 
Shrinkage water . 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Steel hard at cone 3. 
Overfires at cone 5. 
20 . 10 % 
0 . 00 % 
20 . 10 % 
5.00% 
11 . 20 % 
195.3 pounds per square inch. 
24 hours. 
Fire tests: 
Temperature. 
950°C. 
1050 
1150 
1190 
1230 
Linear Shr. 
Per Cent. 
0.00 
0.00 
0.00 
3.00 
3.00 
Absorption. 
Per Cent. 
18.57 
16.38 
12.84 
10.60 
Porosity. 
Per Cent. 
37.10 
36.00 
31.20 
27.00 
Color. 
Buff. 
Buff. 
Gray. 
Gray. 
Gray. 
Numerous lacustrine deposits are found throughout the eastern 
part* of the county. These deposits are usually local and of limited 
extent. 
In the eastern part of the county is a well-defined, irregular ridge, 
extending from Haines City southward beyond Frostproof. Immediate¬ 
ly west of this ridge are several thin sedimentary clays. These strata 
frequently have considerable areal extent, but they are too thin to war¬ 
rant commercial exploitation. A section made on the Highlands Farms, 
four miles north of Lake Wales, which will serve as an example, is as 
follows: 
Section Made in Clay-Bearing Strata on Highland Farms, Lake Wales. 
Feet. Inches. 
Sand . 3 
Clay, gray, sandy . 1 
Clay, grayish red . 1 
Clay, gray, sandy . 1 
Clay, gray, jointed . 1 6 
Sand, red . ? 
