Streak
- The streak is powder from the mineral that leaves a line.
- On a porcelain tile you can do a test it's called a "steak test" the tile has a hardness of 7 and any mineral that is lower number will leave a steak.
- Graphite is used in pencils when you use pencils and your writing you are doing the streak test.
http://www.geevor.com/media/images/Rocks%20and%20Metals/identifying%20metals.JPG
- On a porcelain tile you can do a test it's called a "steak test" the tile has a hardness of 7 and any mineral that is lower number will leave a steak.
- Graphite is used in pencils when you use pencils and your writing you are doing the streak test.
http://www.geevor.com/media/images/Rocks%20and%20Metals/identifying%20metals.JPG