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

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Thames & Kosmos

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Handleiding

WHAT’S HAPPENING

When the water evaporates, the building blocks join back together again. And since that happens rather slowly, they

look for the best place to collect. In this way, particularly beautiful crystals will gradually develop — at least, if

they have enough room and don’t get in each other’s way. This evaporation method is one of the best procedures for

producing large, nicely shaped crystals.

Evaporation method

YOU WILL NEED

› Double-ended measuring spoon

› Display box

› Small measuring cup

› Wooden spatula

› Alum solution from the previous experiment

› Paper towels

HERE’S HOW

1. Start with the jar of alum solution from the

previous experiment. Let the jar of solution

stand for a few days in a warm location.

2. The water will evaporate and the alum will

become deposited on the bottom in the form

of pretty, clear crystals.

3. Remove the small crystals from the jar

using the wooden spatula and place them

on a sheet of paper towel. Let them dry.

4. Put them in the display box and close it

well (see page 9). You will need them later

when you make your geode.

ABOUT

ALUM

Potassium aluminum

sulfate, known

as alum for short,

is obtained from

certain rocks through

a leaching process.

It has been used

for millennia as,

for example, an

ingredient for dying

materials, to stanch

minor wounds, and

most commonly in

the production of

leather and paper.



EXPERIMENT 2

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