You can’t always tell what mineral you’ve got by its colour; lots of them look alike. How can you tell them apart?
- Set of 8 mineral samples: amethyst, azurite, calcite, lodestone, mica, rose quartz, talc, pyrite
- Streak plate
- Write “Sample” in the upper left-hand corner of the piece of paper and make a list of the name of each mineral sample below it.
- Now create another column headed “Specimen colour,” and a third column labeled “Streak colour.”
- Pick up the first mineral sample on your list, and in the Specimen colour column, write down what colour it is.
- Hold the streak plate in your other hand and try to draw a line on it, pressing hard. Be careful, some samples may be harder than the streak plate, and if they are, the “streak” you’re seeing will actually be powdered streak plate! Try to rub away some of your streak. If the scratch plate is scratched underneath, what you’ve got is a scratch and not a streak.
- Write the colour of the streak in the Streak colour column. If there’s no streak, write “none.”
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