Potash Feldspar
Chemistry
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Volatiles
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Links to Other Materials
- Soda Feldspar - Related
- Cache
Hazards
- Feldspar
Miscellaneous
- Family: Feldspar
- Region: North America
- Mined At: Unspecified
- Raw Mineral: No
- Generic: Yes
Notes
One of the most important materials for medium and high temperature ceramic glazes. It supplies potash, alumina, silica and often some magnesia and calcia to the glaze. Potash feldspars are not usually as pure and white as soda spars. A feldspar is called 'potash' if there is more sodium than potassium. There are no real deposits that have the theoretical 17% K2O, none are even close to this, they have a mix of potassium and sodium.
Glazes high in feldspar (35% or more) are likely to produce crazing problems. 'Flux saturated' glazes with more than 50% feldspar may be unbalanced and lack adequate glass former or alumina.
Data
- Melting Point (MP): 1250C M
- Specific Gravity: 2.56
- Specific Gravity: 2.56
- Melting Point (MP): 1250C M
Suppliers
- Generic
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Potash Feldspar" descrip="" generic="1" rawmineral="0" searchkey="K-Feldspar, Orthoclase" loi="0.04">
<families>
<family name="Feldspar"/>
</families>
<regions>
<region name="North America"/>
</regions>
<oxides>
<oxide symbol="K2O" name="Potassium Oxide" status="U" percent="16.920" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="18.320" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="64.760" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="0.040" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
</references>
<hazards>
<hazard name="Feldspar"/>
</hazards>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>One of the most important materials for medium and high temperature ceramic glazes. It supplies potash, alumina, silica and often some magnesia and calcia to the glaze. Potash feldspars are not usually as pure and white as soda spars. A feldspar is called \'potash\' if there is more sodium than potassium. There are no real deposits that have the theoretical 17% K2O, none are even close to this, they have a mix of potassium and sodium.
Glazes high in feldspar (35% or more) are likely to produce crazing problems. \'Flux saturated\' glazes with more than 50% feldspar may be unbalanced and lack adequate glass former or alumina.</note>
</notes>
<testdata>
<testitem testname="1" value="1250C M"/>
<testitem testname="1" value="2.56"/>
<testitem testname="1" value="2.56"/>
<testitem testname="1" value="1250C M"/>
</testdata>
</material>
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