DESC:A CO-CRYSTAL OF SODIUM HALIDE AND POTASSIUM HALIDE AND PROCESS THEREOF ,CLAIMS:1. A co-crystal of sodium halide and potassium halide, said co-crystal comprising of sodium ions and potassium ions in the weight ratio range of 1:4 to 4: 1.
2. The co-crystal as claimed in claim 1, wherein said co-crystal comprises of sodium ions and potassium ions in the weight ratio range of 1:3 to 3:1.
3. The co-crystal as claimed in claim 1, wherein said co-crystal comprises of sodium ions and potassium ions in the weight ratio range of 1:4 to 1:1.
4. The co-crystal as claimed in claim 1, wherein said co- crystal comprises sodium ion and potassium ion in the ratio of 3:1 and said co-crystal has a melting point of 459.1oC.
5. The co-crystal as claimed in claim 1, wherein co- crystal comprises sodium ion and potassium ion in the ratio of 4:1 and said co-crystal exhibits X-ray diffraction pattern as shown in Figure 1.
6. A process for the preparation of a co-crystal as claimed in claim 1, comprising the steps:
a) contacting sodium halide and potassium halide with water to obtain a solution, wherein ratio of sodium ions to potassium ions in the solution is in the range of 1:4 to 4: 1; and
b) crystallizing the solution to obtain the co-crystal composition.
7. The process as claimed in claim 7, wherein the solution obtained in step (a) is optionally filtered to remove the undissolved particles.
8. The process as claimed in claim 7, wherein crystallization is initiated by partial removal of the water from the solution.

9. The process as claimed in claim 7, wherein sodium halide to potassium halide weight ratio is 1:3- 3:1.
10. The process as claimed in claim 7, wherein sodium halide and potassium halide wt % in the solution is in the range of 20 to 80%.
11. The process as claimed in claim 7, wherein the process further comprises the step of separating the co-crystals and drying to obtain the co-crystals in a solid particulate form.