Thames & Kosmos Mineral Discovery handleiding
Handleiding
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Flint
This mineral has been valued
since the Stone Age. When you
strike it, the broken-off flakes
have sharp, hard edges, which can
be used for knives, scrapers, borers,
axes, hammers, and arrowheads or
spearheads.
Flint can be found in nodules up to
30 centimeters across inside certain
rock layers. They probably form from
quartz-containing water. Even back in
the Stone Age, people operated flint
mines by digging shafts into flint-rich
layers of earth.
Quartz crystal
The ancients Greeks imagined quartz crystals to be a kind of ice
that once got so cold that it could not melt again. They called it
“krustallos,” from which our word crystal derives.
In fact, these crystals consist of pure,
clear quartz — one of the most common
substances in Earth’s crust and a component of many
different kinds of rock. It is used in the production
of computer chips, glass, and porcelain. Artificially
cultivated quartz crystals are used to keep precise time
in quartz clocks.
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FACT SHEETS
Mineral Fact Sheets
Pyrite
The brassy, shiny
metallic chunks
contain no gold — even though gold
prospectors used to be fooled by
them every once in a while. That’s
why pyrite is also known as fool’s
gold.
It is an example of an ore, which is a
mineral from which a certain metal
can be obtained. In this case, the
metal is iron — chemically bonded
with sulfur.
Pyrite can be found in
many parts of the world.
The chemical industry
uses small amounts of
it in the manufacture of
sulfur compounds.
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Mineral Discovery |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 15886 MB |
