The article shows new investigation data of sunburn of basaltic rocks made in Mining Department of the Institute of Mechanized Construction and Rock Mining. Researchers try to verify new methods of investigation over sunburn. It provided infrared expose of twenty basaltic samples for fixed time. During infrared exposure and after that samples are put to the ultrasound waves speed investigation and petrographic description. In basalts ultrasound waves speed under 4.000 mps (often even near 1.000 mps) mean textural changes like micro-cracks. Petrographic description can prove sunburn changes in rock samples, for example small spherical light-grey forms, micro-cracks between these forms and lower mechanical resistance (sometimes samples can disintegrated with small pressure). In case when both ultrasound waves speed and petrographic description confirm sunburn in at least one sample it is determined as sunburn basalt.