University of Waterloo
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Waterloo, Ontario, Canada N2L 3G1
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Fluorite is really interesting! When you find it in a rock, all the little crystals will usually be in the shape of cubes. This is the way that the mineral naturally grows!
Fluorite is a soft rock which can be scratched with a common nail (ask your parents for help with this). Some people even like to carve it into sculptures. Fluorite can be found in many different colours. Fluorite image source.
But the coolest thing about fluorite is that it is fluorescent! What does this mean? It means that if you have an ultraviolet light/ a black light (the lights that they use in glow in the dark mini-putt that look purple) and you shine it on the rock then it will glow!!! Fluorite from two different places might glow two different colours under the same light.
Have you ever had a ring that turned your finger green? If so, it was probably made out of copper!
Copper is a natural metal. It absorbs heat very easily which is why we sometimes use it to make pots and pans for cooking. We use it in electrical wires too because electricity flows through it really easily.
Copper is one of only two coloured metals (the other is gold). It is usually a reddish brown colour but it turns green when it’s exposed to air for a really long time (think of the green colour as a form of rust).
It's strange to think about, but we eat copper sometimes! A little bit of it is actually good for us. It is found in hot chocolate powder, chocolate, sesame seeds, nuts, calamari, lobster and many other foods!
If I ask you what a penny is made of, you would probably say copper. This is correct, but it’s not the only thing that pennies are made of! Try this:
Pretty cool eh?
Pyrite is also known as “Fool’s Gold”. It is a very pretty mineral and usually forms interesting crystals.
The word “Pyrite” comes from the Greek words pyrites lithos, meaning “stone which strikes fire”. They discovered that when you hit pyrite with iron it would spark. This is why it was used to start fires!
Pyrite was also polished by Native Americans in early times and used as a mirror!
At the University of Waterloo’s Earth Science Museum we have a display dedicated to the different crystals of pyrite.
Gypsum forms deep under water when creatures like clams, oysters, scallops and other shellfish die. Their remains settle to the ocean floor in layers. Over time, hundreds of layers form and push down from on top of the original layer. This causes it to be turned into rock. Some of this rock contains gypsum.
Gypsum is a very soft mineral. It can be scratched with your finger nail!
Quartz is one of the most abundant minerals on the planet. It comes in a lot of different colours such as pink (rose quartz), yellow (citrine), purple (amethyst), white (milky quartz), red (amethyst with hematite), and brown and grey (smoky quartz). When we want quartz today we often make it in a furnace instead of digging it out of the ground.
Quartz is used in watches! A battery powers a microchip, which sends messages to a quartz crystal, causing it to vibrate 32,768 times a second. Every time the quartz vibrates that exact number, it sends a message to a motor which turns the hands on your watch!
Quartz has been found on the moon!
Calcite is a very common mineral found in most places on earth. Calcite comes in over 300 different shapes, this is more than any other mineral. Pure calcite is colourless or white, but due to impurities it may also be red, yellow, green, honey, pink, lavender, black, brown or blue.
An interesting way of identifying calcite is the acid test. When you place a drop of weak acid, such as vinegar, on calcite it will bubble!
Sodalite is a vibrantly blue mineral which was named for its high sodium content (sodium is in table salt!) It has a greasy lustre, which means that if you can get a good look at a clean crystal then it will look like the surface of the mineral is greasy.
Sodalite is a highly fluorescent mineral. This means that if you have an ultraviolet light (a black light/ the light that is used for glow-in-the-dark mini putt) and you shine the light on a piece of sodalite then it will glow!
Different forms of mica have different names. For example, white mica is muscovite, while black mica is biotite. No matter what the colour, the properties of this mineral group are similar. It is very flexible, you can bend it in one direction and when you let go it will return to its original shape. It is also very soft and you can scratch the surface of mica with your fingernail. Crystals form with really strong bonds in one direction, and really weak bonds in another direction. Because of this, the crystal can be broken apart in sheets!
Labradorite was first discovered in 1770. It was named after Newfoundland and Labrador in Canada, but it is also found in other areas of the world. Labradorite is a type of feldspar (the most abundant mineral family) with stunning colours and visual effects. Its colours can range between violet, blue, green, yellow and even orange-red. These colours are only viewed when rotated at an angle and appears through the entire surface of the stone.
Magnetite is a magnetic rock. In fact, it is the most magnetic mineral on earth. Naturally magnetized pieces of magnetite are called lodestone. It is black and shiny.
There's a piece of magnetite in the Peter Russell Rock Garden. Bring a magnet with you the next time you visit and try to figure out which rock it is! Magnetite image source
Want to find your own magnetite? It’s simple! All you need to do is run a magnet through sand. You should find that little tiny grains of black sand sticks to the magnet, while all other sand doesn’t. What you’re collecting is tiny grains of magnetite! Don’t forget to put it into a plastic bag so that you don’t lose it!