Glauconite was formed by the diffuse impregnation of biomicrites with Bositra and Globuligerina microfacies, both in the nodules and matrix of red nodular limestones of Bathonian to Oxfordian age. The granules (aggregates) of glauconite possess dehydratation rims (voids filled by fibrous calcite) and are partly replaced by calcite rhombs. The glauconite belongs to the polytype modification 1 M; the expanding layers are absent, its structure bears an average amount of defects. According to b - parameter it may be placed among the glauconites with a relatively lower content of Fe in the octahedra.