Gemmology - Elements of symmetry
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Last updated 11:46 PM on 9/26/22
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6 Terms
1
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Centre of Symmetry
- Every crystal system has just 1
2
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Planes of symmetry
- An imaginary square that divides a 3D shape into 2 symmetrical pieces
3
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"[Number]-Fold"
- The number of times a shape appears the same during a 360 degree rotation
- 2-fold, 3-fold, 4-fold, etc.
- Together, all of them add up to the axes of symmetry
- 2-fold, 3-fold, 4-fold, etc.
- Together, all of them add up to the axes of symmetry
4
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Axis/Axes of Symmetry
- An imaginary line that goes through a shape
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Lateral Axis
- Perpendicular (Forms 90 degree angle with) to C-Axis
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C-Axis
- The vertical axis
- May be shorter or longer than lateral axes
- May be shorter or longer than lateral axes
