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Collection: Directories and Documents > Pamphlets
Minerology Handbook by Eckert Mineral Research Prospector Supplies (PH 2-2) (28 pages)
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Page: of 28
EXPERIMENT 1. MAGNETIC MINERALS
A. Suspend a horseshoe magnet by a piece of string so that it 1s
free to swing. Bring the magnet slowly toward a specimen of magnetite or pyrrhotite. Note that as the magnet approaches the mineral it
swings to meet it.
B. File an iron nail and collect a small quantity of filings on a
sheet of paper. Scrape a magnet gently along the under side of the
paper. Note the magnetic response of the filings.
C. Repeat Experiment B, substituting magnetite or pyrrhotite for
the magnet. The same results are obtained.
D. Test the following substances for magnetic properties: Hematite, Limonite. Note that they do not respond to the magnet and they
do not attract iron filings. Both minerals contain relatively large
amounts of iron combined with oxygen. To separate the iron from the
oxygen, or as the mineralogist says, to reduce the mineral, we heat it
in the reducing flame on the charcoal block and with the aid of the
blowpipe. Try this, and when the mineral cools after being heated
intensely for a few minutes, it should reveal magnetic properties.
EXPERIMENT 2, STREAK TEST
Many minerals reveal a different color than that appearing on the
surface when rubbed on the streak plate. Make up a table of your
own minerals and study the streaks.
EXPERIMENT 3. EXPERIMENTING WITH GASES
In some chemical reactions when a gas is produced we are able to
determine the elements present.
A. Preparation And Test For Sulphur Dioxide—When sulphur burns
in oxygen or air, Sulphur Dioxide is formed. Place a small piece of
sulphur in a teaspoon and heat over the flame. The sulphur will suddenly take fire and burn with a blue flame. Note the suffocating odor
which accompanies the burning. This gas in Sulphur Dioxide, and
when mixed with water forms a dilute acid. Place a piece of molstened blue litmus paper over the spoon while the gas is escaping. The
blue litmus turns red, showing the presence of an acid, and at the same
time confirming the presence of Sulphur Dioxide.