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B Clay

Buff Firing Stoneware Clay

Alternate Names: 3B, PR#3 B

OxideAnalysisFormula
CaO0.24%0.025
MgO0.60%0.086
K2O2.70%0.165
Na2O0.10%0.009
P2O50.02%0.001
TiO20.70%0.050
Al2O317.70%1.000
SiO267.80%6.501
Fe2O31.30%0.047
MnO0.01%0.001
LOI6.50
SO30.10
Oxide Weight525.39
Formula Weight562.51
If this formula is not unified correctly please contact us.

High temperature clean buff firing stoneware clay mined at Ravenscrag, Sask.
Analysis updated July 97.

There is some argument whether the mineralogy should be muscovite or illite. Here is the comment of one technician: "With regards to illite or muscovite, the only way to categorically
differentiate between the two is to determine the layer charge (most easily by electron microscopy) which I didn't do. In this sample, the mica component has no detectable expandability which suggests a high charge mica with very little depotassification typical of muscovites. Also, the x-ray scattering domain size is quite large with minimal disorder which you seldom find in illite but expected for muscovite. However, the kaolinite in the sample is extremely fine as one would see in fireclays. 41% quartz in the sample is accurate. You can easily verify this from your chemistry by checking the contributions of muscovite, kaolinite, smectite and K-spar to the total SiO2, and constraining potassium to
muscovite and K-spar, and Mg to smectite. From my experience, a high plasticity and the apparent illitic properties that you see in the clay is most likely due to the discrete smectite content (8%). Note that the activity of smectite is several orders of magnitude (up to 10 times) greater than the finest kaolinite or illite."

424 Ba ppm
34 Sr pmm
24 Y ppm
10 Sc ppm
249 Zr ppm
1 Be ppm
65 V ppm

Pre 2006 Analysis:
CaO 0.17
K2O 2.2
MgO 0.53
Na2O 0.11
TiO2 0.57
Al2O3 15.42
P2O5 0.02
SiO2 71.94
Fe2O3 1.17
MnO 0.01


Ravenscrag Saskatchewan clays fired at cone 10R (top) and at cone 10R with glaze (bottom): A1, A2, A3, 3B, 3C, 3D. The bottom row has also shows solubles salts (SOLU test).

Out Bound Links

In Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="B Clay" descrip="Buff Firing Stoneware Clay" searchkey="3B, PR#3 B" loi="6.50" casnumber="70694-09-6"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.240" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.600" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="2.700" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/> <oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.020" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.700" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="17.700" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="67.800" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.300" tolerance=""/> <oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.010" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="6.500" tolerance="100-1000C"/> <volatile symbol="SO3" name="Sulfur Trioxide" percent="0.100" tolerance=""/> </volatiles> </material>


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