Stoneware Gray Vacuumed Clay - St Amand 10kg (R21855)

Perfect for hand machining, use on a potter's lathe, plate work and pressing.
Color dark gray when unbaked, very pale pink at 1000°C, very light gray at 1280°C.

Biscuit Baking Temperature: 1000 - 1020°C
Maximum Cooking Temperature: 1250 - 1280°C
Packaging: 10 kg (22,05 lb)

Technicial Specifications
Drying shrinkage: 4.8%
Shrinkage at 1280°C: 7%
Porosity at 1280°C: 0.9%
Expansion coefficient 300-500°C: 58 x 10-7
St Amand stonware mud, geologically called "Myennes clay", is a natural clay that comes from strata formed in the Middle Albian at the beginning of the Second Age.
The formation of the mud is due to the alteration of kaolin and feldspars erupted from the volcano of the Morvan mountains (Chateau Chinon massif).
The lacustrine deposits of the fragments have interlayers of kaolinite and feldspar particles, mostly potassium, followed by mica and quartz.

St Amand's stoneware mud consists of:
40% quartz
57% kaolinite
3% micaceous minerals (feldspathic sources)
0.8% organic parts