Rub a finger over the mineral
A mineral specimen's color can be affected by radiation or impurities. A better method would be to use the mineral's streak, the color of the mineral in powdered form.
The observable color is the least dependable method of mineral identification.
migrant
mineral Sedimentary, igneous, or metamorphic, based on their method of formation.
The least destructive method would be to simply identify the desired mineral specimen by eye and pick it up.
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Placer mining.
Specimen color is the least reliable method of mineral identification. Better characteristics are streak, density, and crystal structure.
Oven pit
Interpore space, cementing mineral, mineralogy, and method of formation.
They are classified by origin, method of formation, mineral composition, and texture.