6th October 2019

rocksandminerals
18

How do you determine the hardness of a rock?

By using a simple scratch test, you can determine the relative hardness of an unknown mineral. Select a fresh, clean surface on the specimen to be tested. Hold the specimen firmly and attempt to scratch it with the point of an object of known hardness. In this example, we use a sharp quartz (H=7) crystal .

Hereof, how do you test for a streak?

How to Perform a Streak Test:
  1. Gather the mineral samples that you wish to test.
  2. Choose at least one streak plate (white or black) for the test.
  3. Place the streak plate on a table and scratch the mineral across the plate.
  4. Observe the color of the streak on the plate.

How do you determine a mineral's streak?

The color of the powder is the color of the streak. Instead of actually crushing a mineral to determine the streak, it is much simpler to swipe the mineral across a streak plate. A streak plate is an unglazed piece of porcelain, such as the underside of a ceramic tile.

How do you test the color of a mineral?

Small amounts of impurities can drastically change a mineral's color. Streak: The color of the powdered mineral. The test is usually performed by scraping the mineral across a piece of unglazed porcelain.
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