Spinel MCQs

 

Spinel: 10 Interactive MCQs

Choose one answer for each question, then select Submit Quiz. Incorrect answers include a clear explanation based on the book.

1. What composition does the book list for spinel?

Iron sulfide Calcium iron silicate Zinc sulfide Magnesium aluminum oxide

2. What hardness does the book give for spinel?

3½ 8 6 10

3. What does the book say about spinel’s color and transparency?

It has a wide range of colors and can be transparent to almost opaque It is always red and fully transparent It is only blue and opaque It is always colorless and translucent

4. Which elements does the book associate with the color of red spinel?

Copper and silver Manganese and iron only Chromium and iron Cobalt and magnesium

5. What is the orange-yellow or orange-red variety of spinel called?

Demantoid Melanite Topazolite Rubicelle

6. What does the book say colors blue spinel?

Chromium, and less commonly copper Iron, and less commonly cobalt Manganese, and less commonly silver Nickel, and less commonly zinc

7. What star effect may appear in some spinels cut as cabochons?

A four-rayed or six-rayed star A double six-rayed star only A four-rayed star in every specimen A six-rayed star visible only in faceted stones

8. In which rocks does spinel occur, and what mineral may be associated with it?

Only in limestone, with calcite Only in river gravels, with gold In granites and metamorphic rocks, often with corundum Only in volcanic glass, with obsidian

9. Which places are named as sources of spinel in gem gravels?

Spain, Italy, and France Finland, Turkey, and Italy Canada, Mexico, and Peru Myanmar, Sri Lanka, and Madagascar

10. Since when has synthetic spinel been manufactured, according to the book?

1910 1877 1735 1960