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Flint

Silica

Chemistry CaO 3.000 SiO2 94.000

Volatiles H2O 3.000

Links to Other Materials

• Quartz - Related
• Silica - Related
• Cristobalite - Related
• Cache

Hazards

• Quartz, Crystalline Silica

Miscellaneous

• Family: Silica
• Region: North America
• Mined At: Unspecified
• Raw Mineral: No
• Generic: Yes

Notes

(Richard Willis)

A metamorphic rock high-silica content stone sometimes referred to as pottery quartz or potter's sand. Once calcinated 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.

Suppliers

• Generic
  

Authors

• Tony Hansen (Owner)

Pictures

• Flint Stones

  

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="Flint" descrip="Silica" generic="1" rawmineral="0" searchkey="Flint" loi="0.00">
<families>
<family name="Silica"/>
</families>
<regions>
<region name="North America"/>
</regions>
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="3.000" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="94.000" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="3.000" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<hazards>
<hazard name="Quartz, Crystalline Silica"/>
</hazards>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>A metamorphic rock high-silica content stone sometimes referred to as pottery quartz or potter\'s sand. Once calcinated to 600C flint-stone can be easily crushed to powdered crystals. As with cristobalite, substituting quartz with flint can avoid the quartz-splitting syndrome.&lt;br /&gt;
&lt;br /&gt;
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.</note>
</notes>
<pictures>
<picture description="Flint Stones" filename="flint_stones.jpg"/>
</pictures>
</material>

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