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Carnallite crystals have been synthesized from KCl – MgCl 2  brine solutions at room temperature (23 °C) using a solvent evaporation technique. The effects of the concentration of potassium chloride (KCl) and magnesium chloride (MgCl 2 ) on growth, structural and mechanical properties of the carnallite crystal is investigated and discussed. Transparent and pseudo-hexagonal shaped carnallite crystals with dimensions of 4 × 5 × 2 mm to 16 × 13 × 3 mm are shown. The carnallite crystals were characterized using powder X-ray diffraction and the lattice parameters were found to be  a  = 9.575 Å,  b  = 16.155 Å and  c  = 22.526 Å, space group: Pnna, Z: 12, α =  β  =  γ  = 90° with a unit cell volume,  V  = 3 485.04 Å 3 . The lattice parameters are found to be in good agreement with standard values and the structure of the crystal is orthorhombic. Vickers micro-hardness testing was carried out to determine the hardness and work hardening coefficient of the carnallite crystals.

Synthesis of carnallite crystal from KCl – MgCl 2 solutions and its characterization