Potassium and magnesium based soil minerals derive from which kinds of parent material?

Answer 1

From potassium and magnesium minerals. Common potassium minerals include feldspars and micas, while common magnesium minerals include pyroxenes, amphiboles, micas and dolomite.

Answer 2

Depends exactly what you mean. There is a rock known as magnesian limestone which contains up to about 10-15% of Magnesium Carbonate in addition to the Calcium Carbonate it also contains. If it contains more than about 15% it is generally known as Dolomite.

In areas where these materials occur a good deal of the magnesium in the soil comes from them.

In general though, a lot of these minerals come from the breakdown of such rocks as Feldspar and Mica which themselves are commonly found in granite.

Answer 3

mafic. feldspars.