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Now that we know the proper shape and location for a rain gauge, lets take a look at what they can tell us, and why they are important.
Lets start by imagining that you put a rain gauge in your yard. After a rain, you find that there is one inch of rain in your rain gauge. We can use that to calculate how much rain fell on your yard.
The final step is taking our results and evaluating them. Don't worry if your hypothesis is wrong. That is perfectly good science! Just make sure that you present those results scientifically.
Now we need to design our project so that it will be scientific. This means looking very closely at variables, things that could change the results we get. We want the variable we are testing to change, but we want everything else to be as close to the same as possible.
To perform the streak test, you rub a specimen on a piece of unglazed porcelain tile. Go to your local hardware store, and look at the backs of their floor tiles. You want a tile that is made of porcelain, and the unglazed back should have a white color.
These tiles are very hard (hardness 6.5), and they have a rough surface. As you rub the mineral across that surface, it acts like a file, powdering up some of the mineral. The color of that powdered mineral is its streak color.
