Because weathered surfaces may hide the color of minerals.
Because weathered surfaces may hide the color of minerals.
color
hardness, luster, cleavage and fracture, color (not quite useful) and streak
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The way a mineral breaks is a better clue to its identity than are its color and luster.
Because weathered surfaces may hide the color of minerals.
color
By their color because if 2 minerals were to be the same, both minerals could end up being 2 whole different minerals depending on where they both came from and the origin the minerals were from.
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A streak plate, or unglazed white porcelain tile, is used to perform streak tests which can help to identify minerals. Rubbing the mineral on the streak plate will finely powder it and reveal the color of the powder, which in some cases is quite different from the color of the mineral. Eg: hematite is black but has a red streak - a good way to tell you have hematite instead of one of the many other shiny black minerals.
Color changes can occur easily in some minerals given the right conditions. For instance, when Iron oxidizes it turns to a more redish color.
hardness, luster, cleavage and fracture, color (not quite useful) and streak
My mother is single. The police haven't a single clue as to the perpetrator's identity.
Temperature. See related question
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select yellow color