Ruby (Corundum) MCQs

 

Ruby (Corundum): Interactive 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 ruby, according to the book?

Red, gem-quality quartz A red variety of beryl Red, gem-quality corundum A red variety of garnet

2. What can affect ruby’s shade of red?

Its chromium and iron content Its nickel and copper content Its crystal size alone The way it is polished

3. How does the book describe ruby’s toughness and hardness?

It is soft and easily scratched It is the hardest mineral, harder than diamond It is brittle and has no notable hardness It is tough and second only to diamond in hardness

4. What crystal shape does the book describe for ruby?

Cubic crystals with flat faces Hexagonal prisms with tapering or flat ends Rounded grains with no crystal faces Long fibrous needles

5. What causes the color zoning described in ruby?

Dye applied after the stone is cut Scratches made during polishing New growth layers formed under differing geological conditions and minerals A change from corundum to quartz

6. Where does the book say ruby occurs?

In igneous and metamorphic rocks, or as waterworn pebbles in alluvial deposits Only in pegmatites Only in volcanic cavities Only in limestone caves

7. Where does the book say the finest rubies come from?

Thailand India Vietnam Myanmar

8. What effect can rutile inclusions create in ruby?

A blue-green body color A silky appearance and, in a cabochon, a star effect A yellow color change in sunlight A network of white bands

9. How did Auguste Verneuil produce synthetic ruby, according to the book?

By soaking chalcedony in an iron solution By heating amethyst until it turned red By exposing powdered aluminum oxide and coloring material to a blowtorch flame By placing foil behind colorless goshenite

10. Which set of properties matches ruby in the book?

Aluminum oxide, trigonal structure, hardness 9 Silicon dioxide, hexagonal structure, hardness 7 Calcium phosphate, trigonal structure, hardness 5 Beryllium aluminum silicate, hexagonal structure, hardness 7½