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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Because weathered surfaces may hide the color of minerals.
color
The way a mineral breaks is a better clue to its identity than are its color and luster.
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.
The cleavage of a mineral is the characteristic manner in which it splits along crystallographic structural lines or planes. Cleavage alone is not sufficient to be able to identify a given mineral, but it is a solid clue which, when combined with a few other characteristics, will allow an investigator to identify a mineral. The notation of cleavage will eliminate some minerals and lead the way to being able to categorize a given mineral as something else. A link can be found below.
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hardness, luster, cleavage and fracture, color (not quite useful) and streak
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.
Normally letters are stamped and this stamp may provide a clue.
Temperature. See related question
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