What is the color of a layer of a finely powdered mineral?

What is it? This is very needed for my Science Activity. Thanks in advance!What is the color of a layer of a finely powdered mineral?
You may be referring to a 'streak test', in which a mineral is rubbed on an unglazed tile. The colour of the 'streak' (finely divided particles forming a mark on the tile) may tell you about the mineral. The streak may be a quite different colour from the mineral itself.


for instance, a streak test is a quick way of telling the difference between the two main iron ore minerals Haematite (Fe2O3) and magnetite (Fe3O4). They are often both black in colour; but the streak of magnetite is dark grey; whereas the streak of haematite is red.What is the color of a layer of a finely powdered mineral?
That depends on exactly which mineral it is, and which inclusions/impurities it has trapped in its crystal structure before it becomes a powder of sand sized or smaller (clay, silt) particles. Google phi grain size scale if you are curious. A layer of finely powdered amethyst, the purple variety of quartz, will be different color than a layer of finely powdered rose quartz, because of the differences in the chemical impurities of the atoms that are trapped in the interstices of the crystal structure.