Tetragonal System

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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:

Anatase

Apophyllite

Chalcopyrite

Rutile

Scapolite

Scheelite

Wulfenite

Zircon