magnesium sulfate
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The temperature at which magnesium sulfate heptahydrate loses six molecules of crystal water, along with the corresponding time, as well as the temperature at which it loses seven molecules of crystal water and the corresponding time
Magnesium sulfate dissolves in its own crystal water at 67.5°C. It decomposes upon heating; at 70–80°C, four molecules of crystalline water are lost. At about 200°C, it loses all its crystalline water to become an anhydrous form. It easily weathered into a powder in air (dry conditions); upon heating, it gradually loses its crystalline water to become anhydrous magnesium sulfate
If you have a sample, you can send it over and we can work on it for you; just 10-odd grams of sample is sufficient. Of course, the costs need to be analyzed.