Graphite
talc
It is called a streak and its purpose is to find the hardness of the mineral.
Marbles do have streaks from impurities durring metamorphisis, and they are of various colors
the way a surface reflects light is called talc luster
talc has a white streak
it leaves a white streak
white
Talc can be colourless, white, and pale green.
Graphite
talc
Minerals can be identified by such as their color, streak, luster, and their hardness. What does streak, and luster mean?Streak-- Is the color of a mineral's powder for example: talc is a mineral and it is also powder and its streak is white.Luster-- Is the way a mineral reflects light from it's surface for example: glassy, pearly, silky, metallic and earthy can be words to describe luster.
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It is called a streak and its purpose is to find the hardness of the mineral.
Talc is a mineral.
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Talc is considered an ore. Talc is a silicate, and very soft. The technical name for talc is hydrated magnesium silicate.