No longer mined.
Noted for its flashing when used in slip and salt/soda firing.
Pure clay mineral, there are many brand names of varying purity and iron content.
|Firing Shrinkage||10% at cone 10|
|Ultimate Particle Size Distribution||20 microns: 98%
|Pyrometric Cone Equivalent||33-34|
|Water absorption||10-12% at cone 10|
By Tony Hansen
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