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Potash Feldspar
K2O.Al2O3.6SiO2
Chemistry
Chemistry available on new site, see link above
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
Suppliers
- Generic
Authors
- Tony Hansen (Owner)
XML
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