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A mineral with a hardness of 9, such as corundum, would not leave a streak on a streak plate because it is harder than the plate itself, which typically has a hardness of about 6. A harder mineral cannot scratch a softer material, so it wouldn't produce a streak. Streak is determined by the powder left behind when a mineral is scraped against a harder surface, and since the mineral is too hard, it cannot do so.
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Would the hardest of a mineral affect its performance in the streak test?
The hardness of a mineral can influence its performance in the streak test, but it is not the sole determining factor. Harder minerals may scratch the streak plate, preventing a streak from being produced, while softer minerals can leave a streak more easily. However, the mineral's composition and structure also play significant roles in determining its streak color and consistency. Therefore, while hardness can affect the outcome, it is not the only factor at play.
What mineral will scratch glass but not a sreak plate?
A mineral that can scratch glass but not a streak plate is quartz. Quartz has a hardness of 7 on the Mohs scale, which allows it to scratch glass (which has a hardness of about 5.5) but is harder than the streak plate, typically made from porcelain, which has a hardness of around 6-7. Therefore, while quartz can leave scratches on glass, it will not produce a streak on a streak plate.
What color does garnet leave on a streak plate?
Regardless of the color of the garnet specimen, it would leave a white streak.
Why is a ruby streak color colorless?
A ruby's streak color appears colorless because as a mineral, ruby typically does not leave a streak when rubbed against a streak plate. The color of a mineral's streak is caused by the powdered form of the mineral, revealing its true color when scratched against a ceramic plate, but in the case of ruby, its hardness and structure prevent it from leaving a visible streak.
Do all mineral leave a streak?
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.
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.
What mineral will scratch glass but not a streak plate?
Diamond is the only mineral that can scratch glass but not leave a streak on a streak plate. Glass has a hardness of around 5.5 on the Mohs scale, while a streak plate typically has a hardness of around 6.5. Diamond, with a hardness of 10, is able to scratch glass but not the streak plate.
Would the hardest of a mineral affect its performance in the streak test?
The hardness of a mineral can influence its performance in the streak test, but it is not the sole determining factor. Harder minerals may scratch the streak plate, preventing a streak from being produced, while softer minerals can leave a streak more easily. However, the mineral's composition and structure also play significant roles in determining its streak color and consistency. Therefore, while hardness can affect the outcome, it is not the only factor at play.
What mineral will scratch glass but not a sreak plate?
A mineral that can scratch glass but not a streak plate is quartz. Quartz has a hardness of 7 on the Mohs scale, which allows it to scratch glass (which has a hardness of about 5.5) but is harder than the streak plate, typically made from porcelain, which has a hardness of around 6-7. Therefore, while quartz can leave scratches on glass, it will not produce a streak on a streak plate.
If a mineral has no streak is it metallic?
When identifying minerals, having no streak is a property of hardness. A streak plate has a hardness of ~7(Moh's Scale). Thus any mineral having a hardness greater than 7 will have no streak.Metallic is the description of luster. Or the general appearance of a mineral surface in reflected light.If you were refering to the mineral having metal elements in it, streak is actually very useful for identifying them. Many minerals that are composed of non-metals have a white streak which can appear to be no streak, however there are also many minerals with no streak which are composed of non-metallic minerals (Diamond).
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.
What are 2 minerals that don't leave a streak on a streak plate?
Two minerals that do not leave a streak on a streak plate are quartz and fluorite. Both minerals have a hardness higher than that of the streak plate, so they will not leave a streak when rubbed against it.
What color does garnet leave on a streak plate?
Regardless of the color of the garnet specimen, it would leave a white streak.
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.
Why is a ruby streak color colorless?
A ruby's streak color appears colorless because as a mineral, ruby typically does not leave a streak when rubbed against a streak plate. The color of a mineral's streak is caused by the powdered form of the mineral, revealing its true color when scratched against a ceramic plate, but in the case of ruby, its hardness and structure prevent it from leaving a visible streak.
Why doesn't the topaz leave a streak?
Topaz is a hard mineral, ranking 8 on the Mohs scale of hardness, so it is harder than most common materials used to test streak. Since streak tests are typically performed on softer minerals, such as using a porcelain streak plate with a hardness of about 6.5, the topaz does not leave a streak because it is harder than the material being used for the test.
Will graphite leave a clear streak?
Graphite is a mineral that does not leave a clear streak.
