Review Minerals-8

I used this piece of calcite to scratch this penny. Then I used the penny to scratch the piece of calcite. What does that tell us?

  1. It tells us that I did the test wrong.

    No. The test was done correctly.
  2. It tells us that they both have the same hardness.

    Yes! You test the hardness of a mineral by testing to see what will scratch it. If two substances scratch each other, they have the same hardness.
  3. It tells us that calcite is not a mineral.

    No. Scratching a specimen will not tell you if it is a mineral.
  4. It tells us that calcite has cleavage.

    No. You do not test for cleavage by scratching a mineral.

Click to see which state standards this question tests, and which of my videos, experiments, and other resources support that topic.


SC.4.E.6.2 Identify the physical properties of common earth-forming minerals, including hardness, color, luster, cleavage, and streak color, and recognize the role of minerals in the formation of rocks.


UT.4.III.1.b Observe rocks using a magnifying glass and draw shapes and colors of the minerals.

UT.8.III.1.b Observe and describe the minerals found in rocks (e.g., shape, color, luster, texture, hardness).


5-PS1-3 Make observations and measurements to identify materials based on their properties.