Cristobalite in manganese-silicate


Figure 1: Cristobalite in manganese-silicate, Mag. 400 X, scale bar: 50 µm.

Inclusion name: Cristobalite
Record No.: 9
Inclusion formula: SiO2
Inclusion type (Macro/Micro/Nano): Macro
Inclusion type (Exogenous/Indigenous): Indigenous
Inclusion classification: Oxide
Inclusion composition in weight %: Ct-Cristobalite with 100% SiO2, trace of MnO, M-Matrix with 51% MnO, 3% FeO, traces of Ti, Al and P, partly glassy, partly crystallized rhodonite. Mean analysis (calc.) 34% MnO, 64% Sio2, 2% FeO.
Sample: Basic electric steel, Si-killed, inclusion isolated from the lower central part of a top cast 6 ton ingot.
Steel composition in weight %: 0.16% C, 0.35% Si, 0.67% Mn, 0.015% P, 0.017% S, 0.009% N, 100 ppm O, Al has not been found.
Note: The well developed cristobalite dendrites and their vey low Al2O3 content are an indication of an indigenous origin for this type of inclusion particle.
Reference: Not shown in this demo version.

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