Introduction to petrography

Introduction to petrography

Did you know that petrography is the science that describes and analyzes rocks?

Rocks are categorized according to their composition, their origin, or their method of formation. There are three main categories: igneous rocks, sedimentary rocks, and metamorphic rocks. The rocks from these three categories are also classified according to properties such as consolidation, friability, and coherence.

The main types of rocks are sand, clay, chalk, granite, and diamonds. Most dictionaries state that rocks are consolidated or unconsolidated solid mineral matter or a large mass of stone. In my opinion, these simple definitions are incomplete. They should include the fact that rocks represent an endless source of fun for children!

Have you ever noticed how rocks fascinate children, young and old? In my daycare, rocks are extremely popular. I find them everywhere: in the mouths of babies, in children's pockets, in shoes, inside backpacks, and many other places! For this reason, I suggest you go for a walk with your group and collect rocks of all kinds.

Here are a few ways you can explore the rocks you find with your group:

• Rock collections
• Sorting games (shape, size, color)
• Paper weights
• Pet rocks (painted rocks)
• Rock toss contest
• Construction and building games
• Fill your pockets or containers
• Rock climbing
• Identifying rock shapes (squares, circles, triangles, diamonds)
• Rock, paper, scissors
• Glue them together to create a "monument" or statue
• Decorate pots and containers
• Create a path
• Play hopscotch
• Observe stone dust and rock particles
• Glue glitter on the rocks and display them in the sun

Use your imagination and children's imagination to explore the never-ending possibilities rocks offer.

I think I may love rocks as much as the children in my group. That is probably why my flower beds are filled with decorative rocks. One day, I will create my very own rock garden. In the meantime, I will continue to play with rocks with my group!

Have fun!

Claudine Richard
Early childhood educator

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