GLASS CERAMIC COMPOSITION

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Provided is a glass ceramic composition which has high insulation reliability and can achieve a desired relative permittivity falling within a wide range from a small value to a large value easily merely by controlling the content thereof. A glass ceramic composition for, for example, a ceramic layer (3) in a multilayer ceramic substrate (2) to be contained in a ceramic multilayer module (1), which comprises : a first ceramic comprising MgAl2O4 and/or Mg2SiO4; a second ceramic comprising BaO, RE2O3 (wherein RE represents a rare earth element) and TiO2; a glass comprising 44.0-69.0 wt% of RO (wherein R represents an alkali earth metal), 14.2-30.0 wt% of SiO2, 10.0-20.0 wt% of B2O3, 0.5-4.0 wt% of Al2O3, 0.3-7.5 wt% of Li2O and 0.1-5.5 wt% of MgO; and MnO.