Those minerals that are harder than the unglazed porcelain streak plate will scratch it rather than leave a streak.
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No, not all minerals can produce a streak on a porcelain plate. Only minerals that are harder than the hardness of porcelain (around 6.5 on the Mohs scale) can produce a streak when scratched across a porcelain plate.
Those minerals that are harder than the unglazed porcelain streak plate will scratch it rather than leave a streak.
it is used to test streak, for rocks and minerals
Diamond, corundum, and hematite are three minerals on the Mohs hardness scale that will not leave a streak on the streak plate because they are harder than the streak plate itself.
One physical property that can be used to distinguish hematite from other minerals is its streak color. Hematite typically leaves a reddish-brown streak when scratched against an unglazed porcelain plate. This can help differentiate it from other minerals that may have different streak colors.
To test the streak of a mineral, you will need a streak plate (unglazed porcelain), the mineral sample, and a way to scratch the mineral against the streak plate to observe the color of the powder residue left behind.
A streak is a line or band of a different color or texture from its surroundings, often used to describe patterns seen in minerals or rocks. It can be used in mineral identification to help differentiate one mineral from another based on its unique streak color.