Luni (绿泥, “green clay”) is a unique zisha ore named for its green color or hue before firing. The ore is a rare formation of silty mudstone divided into many subtypes with unique properties, originally mined from the Huang Long Shan Baoshan mining site.
The majority of luni ore is “generic luni”, formed just below the yellow stone layer; generic luni has a larger grain size, higher sintering temperature, and lower firing-shrinkage, resulting in a smooth clay with high porosity.
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