Prehnite MCQs

 

Prehnite: Interactive MCQ Quiz

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

1. Which color range does the book describe for prehnite?

Blue to violet
Pink to red
Often oily green, but also pale yellowish to brown
Colorless only

2. How common are columnar or tabular prehnite crystals?

Rare
The usual form
Found only in gem gravels
The book says they do not occur

3. Which forms of prehnite are more usual?

Flat plates or sharp cubes
Long prisms in parallel groups
Massive metallic crystals
Aggregates of barrel-shaped crystals or botryoidal masses

4. What optical effect may some fibrous prehnite show when cut en cabochon?

A six-rayed star
A cat’s-eye effect
Alexandrite-like color change
Metallic iridescence

5. What color is the fibrous prehnite mentioned for cabochon cutting?

Dark blue
Ruby red
Pale yellowish brown
Black with metallic luster

6. In which geological settings does the book say prehnite occurs?

Basaltic volcanic rocks, intrusive igneous rocks, and some metamorphic rocks
Only limestone caves and marble
Only lead and silver veins
Only alluvial gem gravels

7. Where does the book list pale green prehnite masses?

Australia
France
Madagascar
Scotland

8. Where does the book say dark green or greenish brown prehnite masses occur?

Scotland
Australia
France
India

9. Who first introduced prehnite to Europe, according to the book?

Professor Silliman
Axel Hamberg
Colonel von Prehn
A Crusader from St. John’s Island

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

Orthorhombic, calcium aluminum hydroxysilicate, hardness 6
Orthorhombic, beryllium hydroxyborate, hardness 7½
Trigonal, zinc carbonate, hardness 5
Orthorhombic, lead sulfate, hardness 3