Sedimentary Rocks

Sedimentary rocks are formed when sand, small pieces of rock, or mud are deposited as layers of sediment.

A Few Geology Jokes….

I have been collecting geology jokes for years. I’m not sure where I’ve even heard them all. If I hear one, I write it down. Here are a few of my favorites.

Growing Salt Crystals Experiment

Hey Kids! Try this fun experiment to learn more about growing mineral (salt) crystals.

New Ask-a-Geologist Question: Rock Types

Question: What are the three big groups of rocks? Answer: The three basic rock types are Igneous, Metamorphic and Sedimentary.

Download some Puzzles for Your Children and Students

We have a great selection of free puzzles to download at the Dig Into Geology section of our website. Just choose your topic, click “Get it Now” and print!

New Ask-a-Geologist Question: Metamorphic Rocks

Question: What household items are made from metamorphic rocks?

Staurolite Twins

Staurolite is a silicate mineral which occurs in metamorphic rocks and is often found with the minerals kyanite and garnet. Staurolite is a 7 to 7.5 on the Mohs Hardness Scale which has a range from 1 (softest) to 10 (hardest), has a glassy to resinous luster and a colorless streak. Prismatic crystals of staurolite are common and often found twinned.

How Do Flat Rocks End Up Folded?

Although the land you stand on seems like it is firmly in place, it is actually moving. The Earth’s crust is divided up into pieces that are called “plates.” These plates are slowly moving around the Earth. While they are moving they sometimes bump into one another which causes the rocks on the plates to fold and push their way into mountains.

February Babies, Amethyst is your stone!

February babies are lucky! Amethyst is one of the coolest minerals ever. We love the variations in the purple color and the awesome points that it can form. Amethyst is actually a purple form of the mineral quartz.