Refractory ceramic batch and brick formed therefrom

A refractory ceramic batch with the composition

• a) 75 to 98% by wt. of at least one basic base material from the group:
• sintered magnesia, fused magnesia,
• b) 2 to 25% by wt. of at least one granular aggregate from the group:
• silicon carbide, silicon nitride, silicon oxycarbide, silicon oxycarbonitride,
• c) maximum 5% by wt. of other constituents, relative to the total batch in each case.