Ageologist is comparing the properties of different minerals. he rubs each one on a piece of white tile and observes the color of he power that is left behind. what type of test did he perform?

Scratch Test is your answer

A scratch test is when one rubs a mineral on a piece of white tile, and sees what color is left behind. Also, the mineral that has the scratches is weaker than the material that leaves the scratch mark.

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The test is called as STREAK TEST.

Explanation:

One approach to distinguish the mineral is by playing out the streak test in which a bit of the mineral is scratched over a porcelain tile. The shade of the powder delivered by the mineral on the tile is utilized to distinguish the mineral and the powder shading is known as a streak.

The streak colour of some of the minerals are as follows:

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.