Chatoyant Quartz

 

Chatoyant Quartz: Interactive Gemstone MCQ Quiz

Choose one answer for each question, then select Submit Quiz. Your score and explanations will appear below. Incorrect and unanswered questions include an explanation of the correct answer.

1. What causes chatoyancy in the fibrous quartz varieties described?

Chromium impurities Gas bubbles Crocidolite inclusions Copper spangles in glass

2. Which cut best displays the chatoyant effect?

Cabochon Step cut Brilliant cut Table cut

3. How does the book describe quartz cat’s-eye?

Opaque blue with a metallic luster Transparent red with a glassy surface Colorless and completely transparent Grayish yellow and semitranslucent

4. What produces the yellow and golden-brown stripes in tiger’s-eye?

Green fuchsite mica Iron oxide staining Manganese impurities Heat treatment

5. How does hawk’s-eye form, according to the book?

Quartz is replaced by green mica Amethyst is heated until it turns yellow Crocidolite changes to quartz while its blue-gray or blue-green color remains Iron oxide stains it yellow and golden brown

6. Where does the book identify the most important source of tiger’s-eye?

South Africa Madagascar Brazil Canada

7. Which locations are listed for quartz cat’s-eye?

Brazil, Australia, and the USA South Africa, Namibia, and Zimbabwe Sri Lanka, China, and the former USSR Sri Lanka, India, and Brazil

8. Which additional locations does the book list for chatoyant quartz?

Italy and Spain Australia and the USA Norway and Sweden Egypt and Pakistan

9. Why does the book say this material is called “quartz cat’s-eye”?

To show it is always cut as a cabochon To distinguish it from tiger’s-eye only To avoid confusion with other chatoyant gems, especially chrysoberyl To indicate that it is synthetic

10. Which other inclusion may less commonly contribute to quartz cat’s-eye?

Hornblende Fuchsite mica Pyrite Gas and liquid bubbles