The answer depends on the kind of salt that it refers to. A grain of table salt has a mass of a third to two-thirds milligrams. Large salt crystals, like those used in salt grinders (or for margaritas) have a mass of a milligram or more. The question is ambiguous: like "how long is a piece of string?"
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A grain of salt does not equal 1 milligram; rather, it is approximately 58 milligrams. This discrepancy arises from the historical use of the grain as a unit of measurement in the apothecaries' system, where 1 grain is defined as 1/7000th of a pound. In contrast, the metric system defines 1 milligram as 1/1000th of a gram. Therefore, a grain of salt is significantly larger than 1 milligram.
The mass of one grain of rice is 25 milligram or .025 grams. There are about 29,000 rice grains in approximately one pound of long-grain white rice.
Assuming you mean the obsolete mass unit rather than a grass seed. one grain is 64.799 milligrams.