Geol. 198B Homework #2: Naming and Measuring Gems 20 pts. **

The answers to the following questions will be found in the text reading assignment, and the assigned web essays for Lesson 2.

Required Format: A 2 point penalty will be deducted for not following the format described (even if all the answers are correct)!

Send the answers to me, as an email through WebCT. Use "Homework #2" as the subject line.

As the body of the email, the answers should be arranged vertically, single file, like so:

1. b

2. quartz

3. False

4. etc....

All required answers for Homework #2 are: a multiple choice letter, True/False, or a single word.

When the time period for homework submission has passed, grades will be posted which you may then view using the "My Grades" function of WebCT through the course home page.


1. The standard value of the carat was fixed:

a. by the Federal Trade Commission in 1935

b. in Ancient Persia

c. at the end of the 19th century

d. actually, it is not fixed it varies from country to country

e. in the 17th century

2. Why is "gem silica" a better material to use for jewelry than the mineral chrysocolla?

a. It is substantially harder

b. It is a much prettier color

c. It isn't: chrysocolla is actually better for jewelry use

d. Chrysocolla fades in the light, whereas "gem silica" is stable

e. Chrysocolla is naturally radioactive and dangerous to wear for extended periods.

3. The derivation of the karat system used for measuring gold purity goes back to:

a. carob seeds

b. the King's height

c. the dozen system for selling baked goods

d. the similarity in the color of gold and the color of the vegetable carrot

e. shares of ownership in merchant vessels

4. Spectrolite is a variety name of a feldspar group gem first discovered in the country:


5. True or False: Morganite is a delicate gem which should not be used for most jewelry applications.


6. "Precious" Mexican opal is that which:

a. exhibits play of color

b. has a bright red body color

c. is actually from Mexico

d. comes from Brazil

e. is hard enough to be used in jewelry

7. Sold in the mass market under the misnomer "Rainbow Moonstone", the material is actually:

a. Labradorite Feldspar

b. synthetic moonstone

c. Mexican opal

d. chrysocolla chalcedony

e. a glass simulant

8. Which jewelry store named a type of pink beryl in honor of a famous financeer of the early 20th century?


9. "Gem Silica" is actually a type of:

a. chrysocolla

b. chalcedony

c. opal

d. synthetic gem

e. adhesive used in making doublets

10. Mexican opal which shows color play in transmitted light is known as a ___________ gem.

a. girasol

b. crystal

c. cat'seye

d. contra-luz

e. bi-colored

** "A Word to the Wise": In order to get the full 20 points on this, and every other homework, you must have all the correct answers, they must be in proper format as described above AND your email to me must be received and logged in by WebCT before the closing time for the assignment. As there are inevitable computer downtimes, disconnects and other such issues, I suggest that you do not wait until the very last moment to attempt to submit the work.