This is interesting to make a compositional map and investigate the distribution of elements


import data.csv file (how to import csv file is here)



Processing -> toolbox



search "interpolation"




Choose IDW interpolation or TIN interpolation



- TIN interpolation




1.

vector layer = data (data file)

interpolation attribute =  Mg (z-axis or composition which you want to interpolate)


2. + 

3. choose the method. This time I choose linear

4. Extent add data layer from ...

5. Output raster size
    Smaller pixel size we choose, we get a higher resolution map.
    
    Example
    The result is like the photo below when I did interpolation with the pixel size (0.0001 each)


    The result is like the photo below when I did interpolation with the pixel size (0.000001 each)
6. Run


Changing the Color of the map

1. double click on the layer you want to change the color





2. Render type Singleband gray → 　Singleband pseudocolor



3. Color ramp : Choosing the color variation -> apply -> Ok


Done

    


    
References
link