There are six sources of raw materials for the production of magnesium: magnesite, dolomite, bischofite, carnallite, serpentine and sea water.These sources differ in the magnesium content, in production methods, and in their origin.Some are mined from mines, some in open mining, others originate in various processes carried out on sea water and salt lakes, and another material originates from the waste of the asbestos production process.agnesium Extraction From Sea Water. The history of elementary magnesium started in 1755,when Joseph Black, a Scottish chemist, discovered that magnesia contained a new element, magnesium.
magnitude definition: Magnitude is defined as large in size or very important. (noun) An example of magnitude is the depth of the Grand Canyon. An example of magnitude is the size of the problem of world hunger. ...
Absolute magnitude is the measure of intrinsic brightness of a celestial object. It is the hypothetical apparent magnitude of an object at a standard distance of exactly 10.0 parsecs (32.6 light years) from the observer, assuming no astronomical extinction of starlight.