Dioptase MCQs

 

Dioptase: Interactive MCQ Quiz

Choose one answer for each question, then select Submit Quiz. Your score and explanations will appear below.

1. How does the book describe dioptase’s characteristic color?

Pale yellow with a hint of red
Colorless with a silvery tint
Vivid emerald green with a hint of blue
Dark brown with a metallic sheen

2. What does the book say about dioptase’s fire?

It is very high, but masked by the strong color
It is absent because dioptase is opaque
It is visible only in colorless crystals
It makes the stone appear yellow

3. How can dioptase’s strong color affect its appearance?

It makes every stone colorless
It always makes the stone metallic
It removes the crystal’s cleavage
It may make stones translucent rather than transparent

4. Why is dioptase prized by collectors?

It is the hardest known gemstone
Its vivid color is attractive
It is always completely transparent
It occurs only as large cut stones

5. Why is dioptase rarely faceted for jewelry use?

It is brittle and fragile, and too soft to be worn
It has no color when cut
It cannot form crystals
It dissolves immediately in air

6. Which gemstone is dioptase sometimes confused with?

Topaz
Peridot
Emerald
Phenakite

7. In what type of deposits does the book say the best-quality dioptase crystals are found?

Limestone deposits
Coal deposits
Salt deposits
Copper deposits

8. Which U.S. location does the book list for dioptase crystals?

Montana
Arizona
Colorado
New Mexico

9. What composition does the book list for dioptase?

Hydrated copper silicate
Calcium carbonate
Aluminum oxide
Beryllium silicate

10. Which crystal structure and hardness does the book list for dioptase?

Cubic, hardness 9
Hexagonal, hardness 7
Trigonal, hardness 5
Monoclinic, hardness 3