For February 11 2002
A) Diamond
B) Florine
C) Salt
2. Given the 3 diagrams as above, what are the valencies of the elements shown (F, Na, Cl, C)?
3. a) Name the transitional elements in order as they appear on the periodical table
b) What color(s) does/do each one primarily cause or influence?
4. Compare the chemical compostion of the following pairs of gemstones and note any simularities in their formulae.
a) White sapphire - Clear quartz
b) Calcite - Rhodochrosite
c) Zircon - Rhodonite
5. a) Using the same pairs of stones as in Ques 4, compare the hardness of the stones within each pair. What do you notice?
b) Compare the hardness of the pairs to each other. What do you notice?
6. a) What would you expect to happen to each of the pairs if they were put in acid?
b) Two elementary series that one encounters in gemmology were not represented. Which two? Give an example of each.