Thames & Kosmos Mineral Discovery handleiding

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Thames & Kosmos

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Handleiding

INTERESTING!

Over 150 years ago, the Viennese

mineralogist Friedrich Mohs introduced

scratch resistance as an identifying

feature for minerals. He assembled a

comparative scale of 10 known minerals

for this purpose, each of which he

assigned a Mohs hardness of 1 to 10.

According to this scale, talcum has

a hardness of 1, gypsum 2, apatite 5,

quartz 7, and diamond 10. Collections

of sharp-edged pieces of the various

Mohs minerals (typically lacking just

diamond) are inexpensive and easy to

buy, and are among the basic equipment

of any mineral hunter.

Aha!

Apatite has a hardness of , while quartz

has a greater hardness of . The desert rose,

with a Mohs hardness of , is the softest

mineral in your collection — so soft that

you can scratch it with your fingernail.

Hardness

YOU WILL NEED

TIP!

You can also try

collecting

minerals outside

and testing

them as well.

Try the hardness test yourself. Use a sharp

corner of the apatite specimen to try to

scratch the amethyst or rose quartz. Blow

off the dust and take a look (you may

need a magnifying glass) to see if it really

made a scratch mark.

Then try it in reverse.

What do you find out?

Test all the other

minerals in the kit in the

same way.

Magnifying glass

Ask a grown-

up to help you

with the

scratch test.

Raw diamond in rock. Diamonds are

the hardest of all minerals.



Identifying Minerals

MINERAL TEST 3

Bekijk gratis de handleiding van Thames & Kosmos Mineral Discovery, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.