Freieslebenite

• Named after the mine commissioner of Saxony (Germany) Johann Carl Freiesleben
• Formula: AgPbSbS₃
• Space group: P2₁/a (No. 14)
• Crystal system: monoclinic
• Crystal class: 2/m
• Lattice parameters: a = 7.518 Å, b = 12.809 Å, c = 5.940 Å, α = 90°, β = 92.25°, γ = 90°

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

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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).)

View along the c axis.

• AgS₃ (ditorted) trigonal-planar coordination environment (gray)
• SbS₃ trigonal-pyramidal coordination environment (green)
• PbS₆ distorted octahedra (orange)

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