Assertion: pyrrhotite | /r/CapableOf | transform at approximately 500 °c
Facets:
value: between 520 °c
type: TEMPORAL
Source sentences:
text: All pyrrhotites from the suevites and schist are not stable during temperature treatment up to 700 °C, but transform at approximately 500 °C into a secondary magnetite or maghemite phase with T C between 520 °C and approximately 635 °C.