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hercynite

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hercynite [′hərs·ən‚īt]
(mineralogy)
(Fe,Mg)Al2O4A black mineral of the spinel group; crystallizes in the isometric system. Also known as ferrospinel; iron spinel.
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The occurrence of orthopyroxene and hercynite, and specific chemical composition of high-grade phases, such as a high Ti content in biotite and a high Al content in orthopyroxene, are in accordance with the other geothermobarometric estimates, which suggests the peak temperature of formation over 800[degrees]C and pressure of 5-6 kbar (Fig.
Svecofennian metamorphic zones in the basement of Estonia/Eesti ... by Puura, Vaino; Hints, Rutt; Huhma, Hannu; Klein, Vello; Konsa, Mare; Kuldkepp, Reedik; Manttari, Irme / Proceedings of the Estonian Academy of Sciences: Geology
At iron melting temperatures, hercynite doesn't form as readily as it does at steel melting temperatures.
Iron- and manganese oxides: culprits of refractory erosion by Green, Timothy M. / Modern Casting
For example, aluminum-coated or killed steel used in cast iron melting will result in alumina or alumina complex mineral deposits such as hercynite (iron aluminate), mullite (silica alumina), etc.
Refractory failure in induction furnaces can be limited by Stark, Ronald A. / Modern Casting
 
 
 
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