Ceramic Materials



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Crocus Martis

Anhydrous Ferrous Sulphate FeSo4, Calcined Copperas

OxideAnalysisFormula
Fe2O341.64%1.000
FeO37.48%1.761
SO320.88
Oxide Weight304.02
Formula Weight384.25
If this formula is not be unified correctly please contact us.

Has been used in glazes as a substitute for red iron oxide.

There are varying ideas from country to country about what this material is. Historically it was just a naturally-occurring red iron oxide containing impurities (i.e. clay minerals) or an ultra-high iron clay. Today, Crocus Martis sold by ceramic suppliers is more likely to be a soluble synthetic impure red iron sulphate or a calcined-at-900C version of the sulphate (it is insoluble). This material is not normally highly processed and therefore can produce iron specking in glazes. Normal iron oxides can be used as a substitute (although less will be needed since this material has a significant weight loss during firing).

Sulphur is released during firing and it does not decompose fully until as high at 1200C.


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Crocus Martis" descrip="Anhydrous Ferrous Sulphate FeSo4, Calcined Copperas" searchkey="" loi="20.88" casnumber=""> <oxides> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="41.640" tolerance=""/> <oxide symbol="FeO" name="Ferrous Oxide" status="" percent="37.480" tolerance=""/> </oxides> <volatiles> <volatile symbol="SO3" name="Sulfur Trioxide" percent="20.880" tolerance=""/> </volatiles> </material>


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