Flint
Silica
Formula: SiO2
Richard Willis
A metamorphic rock high-silica content stone sometimes referred to as pottery quartz or potter's sand. Once calcined to 600C flint-stone can be easily crushed to powdered crystals. As with cristobalite, substituting quartz with flint can avoid the quartz-splitting syndrome.
Flint is usually contaminated with limestone (thus the CaO content and the LOI). There will also be trace amounts of iron and MgO. European glaze recipes often call for flint. It is typical to simply substitute quartz.
Out Bound Links
In Bound Links
Pictures
Flint Stones
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Flint" descrip="Silica" searchkey="" loi="0.00" casnumber="87347-84-0">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="3.000" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.100" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="94.000" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.100" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="H2O" name="Water" percent="3.000" tolerance=""/>
</volatiles>
</material> | 
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