Minerals that are the same color may have a different colored streak. Be sure you are testing the mineral you want to identify. After all, you are just powdering up a bit of the specimen. At first glance, it can be difficult to tell if a mineral has a white streak or no streak. $13.99 $ 13. https://en.wikipedia.org/w/index.php?title=Streak_(mineralogy)&oldid=961441574, Creative Commons Attribution-ShareAlike License, This page was last edited on 8 June 2020, at 13:56. These tiles are very hard (hardness 6.5), and they have a rough surface. 4.2 out of 5 stars 36. Streak is the color of a mineral’s powder. Go to your local hardware store, and look at the backs of their floor tiles. Any mineral that has a hardness of 6.5 or less will leave a streak, but what happens if you try to perform the streak test with a mineral that is harder than 6.5? All Rights Reserved. Bornite . You can use the back of a white, glazed tile from the hardware store to rub the mineral sample to produce a streak. You would expect that if you rub a yellow mineral on your streak plate, it would leave a yellow streak. The streak plate has a hardness of glass, so minerals with a Mohs Hardness >7 will scratch the streak plate and won't powder the mineral. The streak test also hides many of the colors caused by impurities. Minerals are formed naturally by geological processes. Streak is a more reliable property than color because streak does not vary. Some carpenters prefer to avoid mineral streaks when they are building cabinets or furniture. In the absence of a streak plate, the unglazed underside of a porcelain bowl or vase or the back of a glazed tile will work. Look closely at your specimen. As you rub the mineral across that surface, it acts like a file, powdering up some of the mineral. The Dolomite Group minerals are best told apart – and from calcite – by their S.G. when color and habit coincides. Enjoy exclusive access to special offers and news. It is a property by which minerals may be described relative to a standard scale of 10 minerals known as the Mohs scale of hardness. In fact, if the mineral is much harder, it may scratch the tile. Mineral - Mineral - Hardness: Hardness (H) is the resistance of a mineral to scratching. Minerals make up Earth's rocks and sands, and are an important component of soils. Cabinets Fit For Royalty, But Affordable For All! If there is no streak, your finger will be clean. A good example of that is the mineral hematite. Streak color is the color of the finely-pulverized mineral. A porcelain tile has a hardness of about 6.5. Some lusters, especially the metallic lusters, can hide the true color of the mineral. You want a tile that is made of porcelain, and the unglazed back should have a white color. However, other carpenters believe that the bands add more character to the wood and opt to keep them. To perform the streak test, you rub a specimen on a piece of unglazed porcelain tile. Be careful testing the streak of delicate or prized specimens. Streak plates are snow-white, unglazed ceramic tiles. Many minerals, such as the quartz in the Figure above, do not have streak. The degree of hardness is determined by observing the comparative ease or difficulty with which one mineral is scratched by another or by a steel tool.
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