Onyx, Sard, and Sardonyx (Chalcedony) MCQs

 

Onyx, Sard, and Sardonyx: 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 mineral family do onyx, sard, and sardonyx belong to?

Beryl Garnet Chalcedony Feldspar

2. How does the book distinguish onyx banding from agate banding?

Onyx has straight bands, while agate has curved bands Onyx has no bands, while agate is always striped Onyx has only green bands Onyx has wavy bands, while agate has straight bands

3. Which description matches sard?

A purple variety with tigerstripe inclusions A colorless variety with gas inclusions A blue variety with fibrous inclusions A brownish-red variety of chalcedony

4. What is sardonyx, according to the book?

A mixture of quartz and beryl A blend of sard and onyx, with white bands and brownish-red color A black variety of smoky quartz A green variety of aventurine

5. Which uses does the book mention for onyx, sard, and sardonyx?

Only as faceted stones for rings Only as uncut mineral specimens Small sculptures, intaglios, inlay, beads, and polished pieces Mainly as spectacle lenses

6. What does the book say has been done to onyx since ancient Egyptian times?

It has been stained to improve or change its color It has been heated to become blue It has been coated with green mica It has been irradiated to become gray

7. How does the book describe one process used to produce onyx from agate?

Soak it in iron solution and polish it Place green foil behind it in a closed setting Heat it in oxygen until it turns yellow Soak it in sugar solution, then heat it in sulfuric acid

8. How may sard be imitated, according to the book?

By heating amethyst until it turns yellow By saturating chalcedony with an iron solution By adding copper pieces to glass By placing silver foil behind goshenite

9. How does the book describe the formation of these banded varieties?

Rutile crystallizes inside quartz veins Manganese replaces the stone’s outer layers Silica deposits in gas cavities in lavas Beryl crystals are weathered into beads

10. How were Roman onyx seals carved to create a raised print?

In negative relief As a cabochon with a domed surface By cutting the stone into beads By polishing away every colored layer