Graphite is a mineral that does not leave a clear streak.
Different minerals produce different colour powders (know as the mineral's 'streak') when scratched. For instance, hematite has a red streak, calcite has a white streak and graphite has a black streak. There is also variation within some minerals, depending on impurities. It should be noted that some minerals are too hard to be scratched by porcelain, and will instead powder the porcelain, producing a misleading white streak.
Feldspar can be a variety of colors: clear, gray, white, tan, pink, brown, or red.
Rubbing the mineral against an unglazed ceramic tile, called a streak plate, leaves a streak of the powdered mineral. This powder reflects the true color of the mineral. It's called a streak test, and the resultant line of color is called the streak. A link can be found below to check facts and learn more.
Yes, there are some very large reserves of graphite in the US. However, graphite is no longer mined in the US because graphite can be synthetically produced using petroleum coke. Petroleum coke is much more pure and economic form of graphite.
Galena's streak is gray, hematite's streak is deep maroon/brown.
i have no idea..... but its probably a no .. take my advice.
i have no idea..... but its probably a no .. take my advice.
Graphite
Graphite leave clear traces on paper, wood etc.
The mineral graphite is soft enough to leave a mark on paper. We use graphite, which is a form of carbon, as pencil lead. And it works pretty darn well at leaving marks on paper.
A streak of graphite is the mark left on a surface when graphite is rubbed across it. It is typically a shiny, metallic gray color. Graphite's streak is often used as a diagnostic property to help identify minerals.
White, but i have no idea why or how, it is used in white pencils replacing graphite and is used to write on black paper
well i really don't know sorry. Here are some useful things close to that... 1. Mica shows clear cleavage. 2. Hardness is a measure of how easily a mineral can be scratched. ill tell you as soon as possible when i figure it out! Thank you
Topaz will leave a streak, it is just that the streak is white and will therefore not be apparent against the white background of the standard streak plate.ALSOTopaz is harder than unglazed porcelain (the streak plate), and therefore normally leaves a scratch rather than a streak.
Corundum has no streak color. Because of being a clear white or light blue, its streak is actually clear.
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.
It doesn't leave a streak.