Strengite

• Named after Johann August Streng (1830-1897), German mineralogist, University of Giessen, Germany
• Formula: FePO₄ · 2 H₂O
• Space group: Pbca (No. 61)
• Crystal system: orthorhombic
• Crystal class: mmm
• Lattice parameters: a = 8.722 Å, b = 9.878 Å, c = 10.8117 Å, α = β = γ = 90°

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Picture: Christian Rewitzer  | 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).)

• FeO₆ octahedra (dark-red)
• PO₄ tetrahedra (green-blue)
• Oxygen (red)
• Hydrogen (white)

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

https://skfb.ly/6BVJs

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