Abstract: Particle size, surface composition and crystal configurations of Kvarkhan’s carnallite were investigated. Particle sizes and composition were determined by sieving and chemical analysis. The results showed that more than 90% of KCl•MgCl₂• 6H₂O crystal particles were larger than 0.177 mm, more than 75% of NaCl particles were smaller than 0.125 mm, and more than 90% of CaSO₄ particles were smaller than 0.074 mm. Surface compositions were studied by X-ray diffraction analysis. Ca/Na of carnallite components were determined by X-ray photoelectron spectroscopy. The results of scanning electron photomicrograph and energy-dispersive X-ray analysis demonstrated that all those crystal particles were present independently in carnallite.