Zircon MCQs

 

Zircon: 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 is the composition of zircon?

Titanium oxide Tin oxide Zirconium silicate Calcium tungstate

2. Which crystal structure is listed for zircon?

Tetragonal Cubic Triclinic Monoclinic

3. What hardness does the book give for zircon?

5 6 7 7½

4. What does the book say about zircon’s colors?

Zircon is naturally only blue Pure zircon is colorless, and impurities can produce several colors Zircon is always black Zircon occurs only in green

5. What is a common purpose of heat-treating brown zircon from Thailand, Vietnam, and Kampuchea?

To change it into ruby To make it opaque and black To produce colorless or blue stones To reduce its hardness

6. What can happen if blue zircon reverts to brown and is reheated?

It can regain its blue color It must become green It loses all color permanently It changes into glass

7. Which clues does the book give for distinguishing zircon from diamond?

Its low density and lack of facets Its fluorescence and magnetic response Its green color and rounded shape Double refraction and wear on facet edges

8. What does the book say can cause zircon to become “low” zircon?

Repeated polishing Radioactive thorium and uranium breaking down the crystal structure Exposure to salt water A change from tetragonal to cubic cutting

9. Where are gem-quality zircon crystals usually found?

Only in coral reefs Only in volcanic ash As pebbles in alluvial deposits Only in glacial ice

10. What meaning does the book associate with the origin of the name “zircon”?

Gold color Rod-shaped stone Fire of the sun Stone of the sea