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Streak is a mineralogical term to describe the colour produced by rubbing a piece of mineral against a (porcelain) neutral background.
Since Opal is made from silica spheres, I'd expect a white streak, but meaningless. There may be powdered spheres left behind from the opal structure.
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∙ 13y ago
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∙ 10y agoThe beauty of opals lies in the fact that they consist of all the colours of the rainbow. The predominant colour is blue, but opals have a variety of colours within, including green, orange and yellow. Those with flashes of red are particularly prized. To see opals, click on the related link below. A list (though not exhaustive) of Opal colours: Cacholong - white like porcelain; Fire Opal - orange to red in colour, semi-transparent; Girasol - transparent blue/white with a ouch of red; Hyalite - colourless; Lechosos - deep green play of colour; Menilite (liver) opal - grey or brown; Mexican waer opal - colourless or yellowish; Milk opal - yellowish, bluish-white, or white; Prase - green coloured; Black opal - can sometimes have been treated to give colour to an otherwise white opal. Opals can be found in Australia, Brazil and fire opal in Mexico.
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∙ 11y agoCorundum has a white streak (colour of crushed mineral powder) but you'll not be able to use the streak test on a streak plate as corundum is much harder (mohs hardness of 9) than the plate (6 1/2).
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∙ 16y agoThe streak of a pearl is white.
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∙ 13y agoWhite
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∙ 11y agonothing
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∙ 13y agoWhite
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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 are 2 minerals that don't leave a streak on a streak plate?
A streak plate has hardness of 7 on the Mohs scale, so harder minerals will not leave a streak. Diamond has a hardness of 10 and corundum is 9 - so neither will leave a streak.
What is ruby streak color?
a maroon color with rotten white
Why is corundum magnetic?
Corundum is not magnetic.
What is corundum used in?
The overwhelming use, by far, of corundum is in the manufacture of abrasives--sandpaper, grinding wheels, etc. Gem grade corundum is used in jewelry.
What color is the streak of corundum?
Corundum has no streak color. Because of being a clear white or light blue, its streak is actually clear.
What is the color of corundum?
Corundum has no streak color. Because of being a clear white or light blue, its streak is actually clear.
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.
Which minerals on the Mohs scale will not leave a streak on the streak plate?
Topaz (8), corundum (9), and diamond (10).
What are 2 minerals that don't leave a streak on a streak plate?
A streak plate has hardness of 7 on the Mohs scale, so harder minerals will not leave a streak. Diamond has a hardness of 10 and corundum is 9 - so neither will leave a streak.
Does the streak test work with all minerals?
No it does not work with all minerals. For if you did not know streak plates have a hardness of 7 (maybe a little lower or higher) on the Mohs scale. Some minerals are harder than 7 though. If they are harder they will not work with the streak test. some examples are Diamond, topaz, and corundum.
What is the plural of corundum?
Corundum.
Why is corundum magnetic?
Corundum is not magnetic.
What is ruby streak color?
a maroon color with rotten white
Is corundum hexagonal or cubic?
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
What important uses does corundum have?
Corundum is used for jewlery
Which crystal system does corundum have?
Corundum is in the trigonal crystal system.
