For the first time investigation of natural basaltic glasses with infrared Fourier microspectroscopy is carried out. It is shown that as a rule IR spectra of the basic glassy matrix are characterized by partially crystalline glass and represented by superposition of not changed glass and crystal phases’ spectra of a different order degree. IR reflection spectra of olivine, pyroxene and plagioclase phenocrysts in glasses are obtained. FTIR microspectroscopy is an effective method of research of structure of such heterogeneous substances as natural glasses.