The authors have investigated the properties of zircon-quartzite and zircon-clay refractories. They have established that the use of both quartzite and zircon in the masses permits the preparation of refractories which expand during heating and have a fairly high refractoriness and softening point under a load of 0.2 MPa; in this connection regeneration of quartz and dissociation of zircon are not intensified. The best quality indices are displayed by specimens containing more than 60% of zircon. Refractories obained from zircon and clay have a high rate of sintering and a higher compressive Strength. There refractoriness and softening point under a load of 0.2 Mpa of specimens with less than 60% Zircon are low,owing to the accelerated decomposition of zircon in the presence of clay and to the resulting high content of the vitreous phase. The thermomechanical indices of the refractories increase with the zircon content.