Streak
-When a mineral is rubbed across an unglazed porcelain tile it leaves a streak.
-The Streak is the same thing as the mineral in powdered form.
-A porcelain tile has a hardness value of 7.
-Minerals that have a hardness value greater than 7 it will not leave a streak if you scratch it on a tile.
-Graphite is a mineral that is used for most pencils.
-Pencil markings are graphite streaks that are soft enough to be left on a piece of paper.
-The streak test is a way to identify what a mineral is, gold will leave a golden colour and pyrite would leave a greenish black or brownish black streak.
-The Streak is the same thing as the mineral in powdered form.
-A porcelain tile has a hardness value of 7.
-Minerals that have a hardness value greater than 7 it will not leave a streak if you scratch it on a tile.
-Graphite is a mineral that is used for most pencils.
-Pencil markings are graphite streaks that are soft enough to be left on a piece of paper.
-The streak test is a way to identify what a mineral is, gold will leave a golden colour and pyrite would leave a greenish black or brownish black streak.