Multiple choice

Which of the following crystal systems contains an additional axes?

  1. Cubic Crystal system

  2. Tetragonal Crystal system

  3. Hexagonal Crystal system

  4. Orthorhombic Crystal system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the hexagonal system, we have an additional axes which gives the crystals six sides. Three of these are equal in length and meet at 60° to each other. The C or vertical axis is at 90° to the shorter axes. Mineralogists sometimes divide this into two systems, the hexagonal and the trigonal, based on their external appearance.

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