Smoky (Brown Quartz)

 

Brown Quartz: 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. Which varieties does the book include under brown quartz?

Yellow citrine and purple amethyst only Light or dark brown quartz, smoky quartz, and black morion Rose quartz and green quartz only Colorless quartz and blue quartz only

2. What is the black variety of brown quartz called?

Cairngorm Citrine Ametrine Morion

3. What is brown or smoky quartz from Scotland’s Cairngorm Mountains called?

Cairngorm Morion Ametrine Rock crystal

4. What color change may occur when colorless quartz is irradiated?

It turns bright green It becomes red It may become grayish brown It becomes permanently colorless

5. What does the book say about much smoky quartz on the market?

It is usually synthetic quartz It is irradiated rock crystal It is heat-treated amethyst It is brown tourmaline

6. How are brown quartz crystals described?

Cubes with flat ends Tabular crystals with square cross sections Rounded pebbles only Hexagonal prisms with pyramidal ends

7. Which mineral inclusion may occur in brown quartz?

Rutile Tremolite Hematite only Bixbyite

8. Where have brown quartz crystals weighing up to 650 lb (300 kg) been found?

Scotland Australia Brazil Spain

9. Which group contains minerals the book says brown quartz may be confused with?

Emerald, aquamarine, and morganite Andalusite, axinite, idocrase, and brown tourmaline Benitoite, apatite, and zircon Pyrite, fluorite, and sodalite

10. Which historical use of smoky quartz does the book mention?

It was used as spectacle lenses in ancient Greece It was used to imitate emerald with foil It was used mainly to make watch crystals It was carved into intaglio seals popular with ancient Romans