Thames & Kosmos Mineral Discovery handleiding
Handleiding
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Aha!
Most of minerals leave behind a
whitish streak, but pyrite reveals its
own true color with a greenish-black
mark. And mookaite often leaves
behind a reddish streak.
Streak test
YOU WILL NEED
INTERESTING!
Many minerals are actually colorless and
owe their apparent color to impurities
from other substances, such as iron or
titanium. It’s more or less like taking
some white sugar and adding a lile food
coloring to turn it blue, red, or yellow.
That’s why a single mineral (such as
quartz) can show up in so many different
colors (as clear or white crystals, as rose
quartz, as amethyst, as flint, etc.). These
“foreign colors,” however, will only show
up in larger specimens, not in powder.
You can take advantage of that fact when
performing a streak test identification.
Only minerals that have their own color
will leave behind a colored streak.
Perform your own streak test. You will
need a piece of unglazed white porcelain,
such as the narrow rough underside of a
cup or plate. Ask a grownup to give you
a piece of old unglazed earthenware,
pottery, or porcelain. Rub the various
minerals across it. Note the color in each
case. What do you find out?
Old plate or saucer
8
MINERAL TEST 2
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Mineral Discovery |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 15886 MB |
