When a biotite granite weathers in a temperate climate, what weathering products

Question

When a biotite granite weathers in a temperate climate, what weathering products will form the soil? Match the mineral component to its weathering product. Each answer is used at least once.

Biotite

      [ Choose ]            Iron oxide            Calcium in solution            Remains unchanged            Clay            Carbonate in solution      

Orthoclase feldspar

      [ Choose ]            Iron oxide            Calcium in solution            Remains unchanged            Clay            Carbonate in solution      

Na-plagioclase feldspar

      [ Choose ]            Iron oxide            Calcium in solution            Remains unchanged            Clay            Carbonate in solution      

Quartz

      [ Choose ]            Iron oxide            Calcium in solution            Remains unchanged            Clay            Carbonate in solution      

Explanation / Answer

Answer) Biotite is weathered to form iron oxide in the soil, because all minerals like biotite getss weathered to form FeO in thepresence of water. Biotite has Fe in its formula and has OH ions.

Orthoclase feldspar also is weathered to form clay. Because it is also a aluminosilicate weathered to form clay minerals.

Na Plagioclase also is weathered to form clay minerals. Because it is a aluminosilicate.

Quartz remains unchanged even if the rock undergoes weathering. Quartz crystallises in the hexagonal system, has a hardness of about 6.5 and is very much resistent to weathering, therefore quartz remains unchanged during weathering of rocks.

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