Natural Inclusions MCQs

 

Natural Inclusions

12 questions · Four options each

1. What are inclusions?

The flat surfaces on a crystal
Internal features of gems
External scratches made during polishing
The layers used to form a jewelry setting

2. Which description matches the types of inclusions discussed in the book?

Only solid crystals inside a gem
Only bubbles in volcanic glass
Only cracks that form before the host stone
Solids, liquids, gases, or filled cracks and fractures

3. How can inclusions help identify a gem?

Some are characteristic of a species or locality
Every gem has exactly the same inclusions
They reveal the stone’s exact weight
They replace the need to examine the stone

4. How do solid inclusions usually become enclosed in a host stone?

They form only after the host is cut
They enter through the polished surface
The host crystal grows around them
They form when the stone is set in jewelry

5. What may happen when inclusions form at the same time as the host crystal?

They always dissolve
They may align with the host’s atomic structure
They prevent the host from crystallizing
They become external fractures

6. What causes the star effect in the rubies and sapphires described?

Gas bubbles trapped after polishing
Rounded apatite crystals
Liquid-filled fractures crossing the surface
Rutile needles aligned parallel to the corundum crystal faces

7. What may healed cavities or fractures resemble?

Feathers, insect wings, or fingerprints
Crystal faces and cleavage planes only
Metal flakes and polished facets
Layers of shell and coral

8. What magnification range does the chapter give for the illustrated inclusion microscope?

2 to 5 times
5 to 10 times
10 to 40 times
40 to 100 times

9. What does the book say a peridot “water lily” inclusion contains?

A central rutile needle surrounded by gas
A central chromite crystal surrounded by liquid droplets
A garnet crystal surrounded by quartz
A trapped insect surrounded by amber

10. What are the moonstone “centipedes” described in the book?

Tiny fossilized animals
Rows of solid garnet crystals
Rutile needles formed during crystal growth
Parallel cracks caused by strain

11. How does the book describe insects occurring in amber?

They can be trapped by sticky resin as it is exuded
They grow inside the amber after it hardens
They are always added to natural amber by people
They form when amber is polished

12. In the almandine garnet example, what causes the bright interference colors?

The rounded apatite inclusion
The garnet’s polished surface
A zircon crystal
Liquid droplets in the stone