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The topic zoning is discussed in the following articles:
The salt deposits of a salt pan are zoned like bathtub rings, with less-soluble sulfates and carbonates at the outer margin and highly soluble sodium chloride (table salt) at the centre. The crystallization of these salts can be compared with the evaporation of brine in a dish. The first precipitates from the evaporating brine are calcium carbonate (CaCO3) and magnesium carbonate...
...the series designate relative proportions of the end-members. Although plagioclase grains in some rocks are essentially homogeneous, those in many rocks are zoned—i.e., different parts of individual grains have different Ab and An contents. One explanation for zoning in plagioclases formed from magmas can be implied from information known about the...
Finally, crystal zoning describes faintly to very well-defined geometric arrangements of portions within individual crystals that differ significantly in composition (or some other property) from adjacent portions; most common are successive shells grouped concentrically about the centres of crystals, presumably reflecting shifts in conditions during crystal growth.
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