Look at your mineral specimens and answer
the following questions.
FLUORITEis made up of calcium fluoride
(CaF2) which usually grows in cubic crystals. It breaks
into 8 different faces to give a diamond look (octahedral
cleavage). Fluorite can be found in many colors, and can be
scratched by a steel knife. Fluorite is a common mineral, that is
found all around the world. In the United States the best known
location is in southern Illinois and northern Kentucky. Fluorite is
used in making steel, in decorative glass, in enameling cooking
utensils, and for hydrofluoric acid. The name comes from the Latin fluere,
meaning to flow since is melts easier than other minerals.
Look at the 2 types of fluorite. Describe
The pieces of both types of fluorite have
been broken. When a mineral breaks into smooth surfaces this is
called "cleavage." What word do you think cleave is
derived from? Explain.
What do the two specimens have in
Fluorite is calcium fluorite. What elements
make up fluorite? (Hint: use your periodic table)
Is fluorite harder or softer than quartz?
How can you tell?
Do you think color is a key characteristic of
(Cu5FeS4) is a copper ore that rarely is found
in crystal form. Bornite is usually found associated with other
copper minerals. Bornite when exposed to the atmosphere will tarnish
blue to purple. It's primary use is as an ore of copper. Bornite is
named after the German mineralogist von Born.
Bornite is a copper compound that is called the "peacock
ore." Why is bornite called the peacock mineral?
Bornite chemical composition is Cu5FeS4.
Write out the elements that are in Bornite. Can you guess why it
makes this "tarnish" color?