Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding

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Handleiding

WHAT’S HAPPENING

The compass needle identifies magnets, because it is itself a small magnet with a north

and a south pole. It reacts to magnetite because this mineral is magnetic. For that reason,

the compass needle always turns its opposite end toward the magnetite as you rotate the

piece around it. Like poles repulse each other, and unlike ones attract each other.

Hematite, on the other hand, acts like an iron nail: it is simply attracted by

the magnetite. Your other

minerals are all nonmagnetic.

Your magnet might

also possibly react to the

limestone. That would mean

that the limestone contains

natural iron compounds that

have become embedded in it.

Geologists use tests

including this one to identify

rocks and minerals according

to their different properties.

6 4 2113 - 0 2 -16 0119

Magnetism

YOU WILL NEED

› Compass

› Minerals

HERE’S HOW

1. Place the compass on the table and notice

how the needle stands still.

2. Pass the minerals, one after another, by the

compass without touching it. Which one

makes the needle move? Rotate the mineral

around the compass. How does the needle

react now?

ABOUT

MAGNETITE

Hardness Density

5-6 5

This important ore is,

like hematite, a

compound of iron

and oxygen, but in a

different

composition. It is

strongly magnetic —

hence its name. This

is the mineral that

led to the discovery

of magnetism

thousands of years

ago, and it was used

to make the first

compasses. Many

living organisms

(certain birds, bees,

and bacteria) have

tiny magnetic

particles in their

bodies that they can

use to sense Earth’s

magnetic field.

Important:

For all experiments,

always wear the

appropriate eye

protection!

An Experiment to Hit the Ground Running

What happens when the mineral magnetite is brought near the

compass? Try it and see for yourself!

WANT MORE?

Let’s get started on our

experiments with crystals,

rocks, and minerals ...

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