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Phenakite MCQs

on September 28, 2026

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Phenakite: Interactive MCQ Quiz

Choose one answer for each question, then select Submit Quiz. Your score and explanations will appear below.

1. Which crystal forms does the book describe for phenakite?

Green cubes and flat plates
Red octahedra only
White or colorless tabular crystals or stubby prisms
Blue fibrous masses

2. What feature is common in phenakite and helps distinguish it from rock crystal?

Twinning
A metallic luster
Green color zoning
A six-rayed star

3. Why does the book connect the name phenakite with the idea of “cheating”?

It changes color when touched
It was used to counterfeit gold
It breaks tools during mining
It is often mistaken for rock crystal

4. For whom are transparent phenakite crystals faceted, according to the book?

For industrial cutting tools
For collectors
For use as building stone
For making window glass

5. In which geological settings does the book say phenakite occurs?

Limestone caves, beaches, and river deltas
Coal seams and salt beds only
Pegmatites, granites, and mica schists
Coral reefs and volcanic ash deposits

6. Which set of locations is listed for the best phenakite crystals?

Brazil, the Urals in Russia, and Colorado in the USA
Thailand, Myanmar, and East Africa
Italy, England, and Germany only
Queensland, New South Wales, and Montana

7. Which group does the book list as other phenakite localities?

Canada, Iceland, and Greenland
Thailand, Japan, and Australia
Mexico, Peru, and Chile
Italy, Sri Lanka, Zimbabwe, and Namibia

8. How much did the remarkable phenakite pebble found in Sri Lanka weigh before cutting?

569 carats
1,470 carats
2,000 carats
147 carats

9. What was produced from the Sri Lankan phenakite pebble when it was faceted?

One 1,470-carat round stone
Several cabochons only
A 569-carat oval and several smaller stones
One 569-carat square stone

10. Which set of properties matches phenakite in the book’s table?

Trigonal, beryllium silicate, hardness 7½
Trigonal, calcium carbonate, hardness 3
Hexagonal, silica, hardness 7
Cubic, aluminum oxide, hardness 9

Location: Pakistan

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Phenakite MCQs

Phenakite: Interactive MCQ Quiz

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