Because is not recommended to eat dirty salt.
Pure Epsom salt - MgSO4.7H2O - is a white powder.
Halite is NaCl which is the same thing as table salt
One experiment you could carry out is to dissolve both rock salt and table salt in water and compare the clarity of the resulting solutions. Rock salt typically contains more impurities than table salt, so the solution made from rock salt would likely be cloudier due to these impurities. Additionally, you could conduct a simple taste test to compare the purity of the two salts.
Rock salt is in some ways similar to Coarse Salt, but do have differences, these are, rock salt is mined from underground deposits and goes through various processing techniques whilst coarse salt ( Kosher) is relatively pure and contains no iodine or any other additives.
Firstly you grind the rock salt with a pestle.Then you start to dissolve the salt. After that you filter it.Last but not least we allow the water to evapourate.In the evapourating basin there should be pure salt left over.Add. In rock salt, there will be other contaminants such as magnesium and calcium salts. These have different solubilities, and careful decanting is needed to decant the (say) Mg rich liquid, leaving the Na material behind.But this is the way it is done at the salt works.
By evaporating the water of the solution and condensing it.
Generally rock salt is more impure than table salt.
Rock salt and table salt are both sodium chloride - NaCl; table salt is the pure form of rock salt.
It's really try it and you will find out relative
Rock salt contains all the minerals found in the seawater from which it formed. These will be many, but NaCl will be the main one.
It is a house which helps rock salt turn into pure salt!
This is possible only after the determination of impurities in the rock salt.
The luster of rock salt is Vitreous (glassy)
This percentage is determined by chemical analysis; for some salt mines this percentage is over 99 %.
Dissolving tanks, filters and crystallization/recrystallization equipments.
Pure Epsom salt - MgSO4.7H2O - is a white powder.
evaporation followed by filitration