Two axes are of equal length and are in the same plane, the main axis is either longer or shorter, and all three intersect at right angles.
Based on a rectangular inner structure.
Crystal shapes include:
- Four-sided prisms and pyramids
- Trapezohedrons
- Eight-sided and double pyramids
- Icosi-tetrahedron (pyrite, sphalerite)
- Hexacisochedron (pyrite).
Common Tetragonal Crystals:
Rutile |
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Wulfenite |