Streak
- When a mineral is rubbed across a piece of unglazed porcelain tile, it leaves a streak.
- The streak is the colour of the powdered form of the mineral.
- Pencil marks are graphite streaks that are soft enough to be left on a piece of paper.
- A streak test is one way to identify whether a mineral sample is gold or pyrite. Gold leaves a golden streak. Pyrite leaves a greenish-black or brownish-black streak.
- The streak is the colour of the powdered form of the mineral.
- Pencil marks are graphite streaks that are soft enough to be left on a piece of paper.
- A streak test is one way to identify whether a mineral sample is gold or pyrite. Gold leaves a golden streak. Pyrite leaves a greenish-black or brownish-black streak.
Mr.Hong's slide show