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Burnt Sienna

Description: A very high iron ochre

Oxide Analysis Formula Tolerance
CaO 1.00% 0.61
Al2O3 3.00% 1.00
SiO2 19.00% 10.75
Fe2O3 72.00% 15.30
H2O 5.00%n/a
Oxide Weight 3,230.00
Formula Weight 3,400.00

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Materials Raw Sienna
Typecodes Clay Other
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
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