Science project

Mineral Streak


What is streak and how can it be used to identify a mineral?


  • Piece of unglazed white porcelain (back of tile would work fine)
  • Assorted  metallic and non-metallic minerals. good choices include:
    • Iron pyrite
    • Hematite
    • Mica
    • Talc
    • Halite
    • Magnetite


  1. Make a table similar to the following




















  1. Record the color of the mineral sample in your data table.
  2. Rub the mineral sample across the streak plate. Record the color of the powder on the plate.  If your mineral sample is very hard, the powder you see might be that of the streak plate rather than the mineral itself.


Minerals that contain metals tend to make a streak at least as dark as the mineral itself, while nonmetallic minerals tend to make clear or white streaks.  Iron pyrite makes a greenish-black streak, while hematite makes a reddish-brown one. Talc, mica, and halite all make white streaks.


Minerals are made of elements, or compounds that have distinctive properties. Some of the most valuable minerals contain metals. Metals, like gold, iron, copper, and silver are easily shaped. Many can be used for cooking and carrying electricity. In their pure form, metals often appear shiny. Powdered metals often appear dark. Iron pyrite and hematite both contain metals; talc, mica and halite do not.

Going Further

There are many other tests you can do to identify minerals. Since both gold and iron pyrite contain metals, streak alone can’t help you tell a gold nugget from a pyrite nugget—but measuring density can.  Find the volume and mass of your sample. Divide the mass by the volume. Pure gold has a density of 19 g/mL, while Iron pyrite has a density of 5 g/mL.

Disclaimer and Safety Precautions provides the Science Fair Project Ideas for informational purposes only. does not make any guarantee or representation regarding the Science Fair Project Ideas and is not responsible or liable for any loss or damage, directly or indirectly, caused by your use of such information. By accessing the Science Fair Project Ideas, you waive and renounce any claims against that arise thereof. In addition, your access to's website and Science Fair Project Ideas is covered by's Privacy Policy and site Terms of Use, which include limitations on's liability.

Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state's handbook of Science Safety.

Add to collection

Create new collection

Create new collection

New Collection


New Collection>

0 items