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Shale is a type of rock, not a mineral. Streak is used to help classify minerals. It can leave a streak, but it doesn't mean anything.
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Which group of minerals is streak most useful for?
The colour of the streak left by a mineral is one of the features used to identify it. For instance, haematite leaves a red streak, malachite leaves a light green streak, while quartz, calcite and gypsum all leave a white streak.
What mineral leaves a colorless streak?
The mineral Quartz leaves a colorless streak.
What is the difference between color and streak in minerals?
Color is the observable color of a mineral specimen in natural light. Streak is the color of a mineral when powdered. The color of a specific mineral specimen may be different than its streak color. Because many impurities can alter the color of a mineral, but not the streak, streak is a more accurate predictor in mineral identification.
How do you know a mineral's streak?
The streak of a mineral can distinguish between two samples that have the same color. The streak is often a different color. To test streak, use a streak plate. This is a piece of unglazed porcelain, like the back side of a tile.
Can all minerals produce a streak on a porcelain plate?
Those minerals that are harder than the unglazed porcelain streak plate will scratch it rather than leave a streak.
Will graphite leave a clear streak?
Graphite is a mineral that does not leave a clear streak.
What happens if you rub the mineral across a streak plate but the mineral does not leave a streak?
The lack of a streak would indicate that the mineral is harder than the streak plate, or the color of the streak is the same as the color of the streak plate.
Will diamond leave a streak on a streak plate?
Diamond will not leave a streak on a porcelain streak plate because diamond is harder than the streak plate. It will leave a scratch on the streak plate for the same reason.
Which group of minerals is streak most useful for?
The colour of the streak left by a mineral is one of the features used to identify it. For instance, haematite leaves a red streak, malachite leaves a light green streak, while quartz, calcite and gypsum all leave a white streak.
What color streak does the mineral nickel leave?
Nickel leaves a silver-gray streak. Note that nickel is an element.
If a mineral doesn't make a streak is it not a mineral?
Minerals with a hardness greater than around 7 on the Mohs hardness scale will not leave a streak on a standard unglazed porcelain streak plate. They will instead scratch and powder the streak plate.
Why doesn't the mineral topaz leave a streak on a streak plate?
It leaves a scratch instead of a streak because Topaz has a higher number on the Moh's scale compared to the streak plate.
Why could the streak of corundum be difficult to determine?
The mineral corundum, with a Mohs hardness of 9, will be harder than a ceramic streak plate and therefore leave no streak.
What is a streak when it comes to talking about science?
'streak' is the color that a mineral will leave when rubbed on a piece of unglazed porcelain. It is used to help identify the mineral. For example, arsenopyrite looks very similar to gold, but has a dark grey or black streak. Gold has a yellow streak.
How do you determine a mineral’s streak?
The color of a mineral in powdered form is called the mineral's Streak
The mineral talc is soft enough to leave a streak on paper and is commonly used in?
Graphite
What test is used to identify a minerals color?
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.
