Meet the Rocks – Rock Properties


Hands-on lesson teaches rock properties of hardness, streak, and luster.  Includes rock ID key.

Rock id key | Rock hardness luster and streak | Rock characteristics

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Rocks are always there, under our feet.  But who is that rock down there?

Different types of rocks have unique physical properties.  Just like people have different heights, hair colors, and eye colors, rocks have differences that help us tell them apart.

So lets meet our rock neighbors!  In this lesson we will:

  • Collect local rocks
  • Determine rock streak with streak plates
  • Test rock hardness
  • Key out rock samples to see just who those rocks are!


Time to Complete
10 minutes prep, 30+ minutes cookie baking, 15+ minutes game


Concepts & vocabulary

Rock Identification & Physical Properties of Rocks

Streak, Mohs Hardness scale, luster, dichotomous key


Take it Outside
Most of our games and lesson to be done outside but this game CAN BE DONE IN THE CLASSROOM. But we suggest you take it outside if you can. It can easily be done in the schoolyard or the backyard.


This Lesson Contains

-full lesson about rock properties: luster, streak, hardness, crystals

-rock ID key for 18 common rocks (or buy the key separately here)

-Identify your Rock worksheet




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