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streak test, hardness test, scratch test, color test
They show you the true color of the mineral. Small impurities can cause big changes in the color of a mineral.
Color
color
Color Replacement Tool you can use to replace existing colors on image with Foreground color by painting with brush.
Use the scratch test.
you can use streak by rubbing 2 minerals on a white hard surface. If the mineral leaves color its calcite and if it doesnt its halcite
because the color of a mineral can be the same as some other minerals but all minerals have a different property between them
Simply because colour has nothing to do with any other property of the substance in question.
Red
Ohm Meter
Memory Diagnostics