Mineral constituents of chondrules and matrices of the unequilibrated ordinary chondrites Chainpur (LL3), Mezö-Madaras (L3) and Tieschitz (H3) have been studied by means of transmission electron microscopy and attached energy-dispersive X-ray microanalysis. As is typical for petrologic type 3, clinopyroxene is the dominant pyroxene, orthopyroxene is very rare. While in Chainpur orthopyroxene occurs only a few unit cells in width intercalated with Ca-poor clinopyroxene, some chondrules of Mezö-Madaras contain intimately intergrown ortho- and clinopyroxenes (Ca-poor) of about the same amount. In a Tieschitz chondrule pure orthopyroxene crystals without planar defects parallel (100) were observed. The Ca-poor clinopyroxenes of all three meteorites are polysynthetically twinned on (100). In clinopyroxenes of intermediate composition, exsolution in augite and pigeonite is observed on a very fine scale of a few hundredȧangstroms on (001) and (100) or modulated structures are seen, both due to rapid cooling. Dislocations in olivine with Burgers vector [001], which indicate plastic deformation by shock waves, have been found in the matrices of all three meteorites. However, only chondrule olivines of Mezö-Madaras appear to be affected by shock waves. Chondrule olivines of Chainpur are free of dislocations. Those of Tieschitz contain only few dislocations, among them dislocation loops which are characteristic of recovery. Troilite of all three meteorites shows antiphase domain boundaries with the displacement vector 1/3<1 ¯10>. Dislocations with Burgers vector 1/3<1 ¯10>, probably induced by shock, were observed in Mezö-Madaras and Tieschitz. In Mezö-Madaras taenite polysynthetically twinned on {111} which indicates shock deformation was found. The dark matrix of Chainpur and Tieschitz contains a mixture of kamacite (4–10 mol.% Ni) and probably magnetite according to energy-dispersive microanalysis and electron diffraction. In the case of Chainpur the crystallinity appears to be extremely poor whereas in Tieschitz the crystal size is 120–200Å. In the matrix of Chainpur vesicular glass with a normative composition of pyroxene has been observed.