• Named after its type locality Spessart (Bavaria, Germany)
  • Formula: Mn3Al2[SiO4]3
  • Space group: Ia-3(No. 230)
  • Crystal system: cubic
  • Crystal class: m-3m
  • Lattice parameters: a = = c = 11.621 Å, αβ = γ = 90°

Picture: Rob Lavinsky – iRocks.com  | CC BY-SA-3.0

Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • MnO8 polyhedra (purple)
  • AlO6 octahedra (blue)
  • SiOtetrahedra (orange)

For a 3D interactive version on sketchfab, see here:



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