It shows it's pure color so if a rock has impurities on the outside, it shows the true color.
there is no name for the color, but there is the "streak" of a mineral, meaning the color of its streak.
It's called the minerals streak
streak
A streak test is used to determine a minerals streak color. This can help in with the identification of minerals. A streak test is performed by rubbing the mineral on an unglazed ceraminc tile, then observing the color of the streak which is left behind. All minerals do not leave streaks. Harder minerals will not streak, but this can also be used as a tool for identifying the mineral, if you are familiar with the hardness scale.
A streak test is used to determine a minerals streak color. This can help in the identification of minerals.
The color of a mineral in powdered form is called the streak color.
It's referred to as the streak, the color of which is used as an identifying characteristic of minerals.
hardness streak and luster and color
hardness streak and luster and color
The color of a mineral in powdered form is called the mineral's Streak
Streak color is determined by scraping the mineral across a a streak plate, (which is made of unglazed porcelain), and then observing the color of the streak, which is left on the plate. Note that some minerals do not leave a streak, as they are too hard. Thus, it is important to learn other identification methods, to use in conjunction with streak color, in order to identify minerals.
its called streak