62 GEOLOGY AND MINERAL RESOURCES OF MISSISSIPPI. 
Analysis of Holly Springs stoneware clay, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (SiOs) 67. 70 
Alumina ( A1 2 3 ) 19. 69 
Ferric oxide (Fe 2 3 ) 3. 04 
Lime (CaO) 1. 06 
Magnesia (MgO) 58 
Sulphur trioxide (S0 3 ) 19 
Moisture 94 
Loss on ignition 6. 64 
99.S-1 
Allison stoneware clay. — The clay used by the Allison pottery comes from a pit along the 
same branch as the Holly Springs stoneware-clay pit. The Allison clay differs from the 
other clay in being stratified instead of occurring in lenses. At the top of the pit are 4 to 5 
feet of Lafayette, below which are 10 feet of clay. The upper half of the clay is more are- 
naceous than the lower and has a pinkish color. The lower half is a white plastic clay 
which is used for making stoneware. Immediately below the white clay is a thin band of 
lignite, and this in turn is underlain by 4 to 5 feet of variegated sands. A glance at the 
sands shows white, Mack, red, orange, yellow, and blue colors. The following analysis 
shows the composition of the Allison clay: 
Analysis of Allison stoneware clay, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 61. 69 
Alumina ( A1 2 3 ) 24. 91 
Ferric oxide (Fe 2 3 ) 2. 04 
Lime (CaO) 34 
Magnesia (MgO) 83 
Sulphur trioxide (S() 3 ) 20 
Moisture 1.51 
Loss on ignition 8. 07 
99. 59 
Frisco fire clay.— About 100 yards east of the Frisco depot at Holly Springs is a deposit 
of white sandy clay which is made into fire brick and used in lining the kilns of the Holly 
Springs Stoneware Company. The bricks stand the highest degree of heat required in 
burning the ware without going to pieces. In appearance the clay is little more than a 
mass of slightly bonded sand which occurs at the surface in large bodies and is distinct in 
color from the loose variegated sands in the vicinity. The following is an analysis of this 
clay: 
Analysis of Frisco fire clay, Marshall County. 
[By W. F. Hand, Slate chemist.] 
Silica (Si0 2 ) • 88. 52 
Alumina (AI2O3) 5. 26 
Ferric oxide (Fe 2 3 ) 1. 64 
Lime (CaO) 73 
Magnesia (MgO) 13 
Sulphur trioxide (S0 3 ) 43 
Moisture 87 
Loss on ignition 1. 93 
99.51 
A clay very similar to the one above mentioned, as is shown by the analysis given below, 
occurs just south of the Frisco depot: 
