Vanadinite

Named for its vanadium content
Vanadinite is the most important source of vanadium and finds application as V₂O₅ in the famous contact process (production of sulfuric acid) and in alloys for chromium-vanadium steel (typically the content is below 0.2 %)
Formula: Pb₅(VO₄)₃Cl
Space group: P6₃/m (No. 176)
Crystal system: hexagonal
Crystal class: 6/m
Lattice parameters: a = b = 10.299(2) Å, c = 7.308(1) Å, α = β = 90°, γ = 120°

Picture: Didier Descouens – CC BY-SA 4.0
https://commons.wikimedia.org/w/index.php?curid=12436369

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).)

PbO₉ irregular polyhedra (black)
PbO₇ capped trigonal prisms (blue)
VO₄ tetrahedra (purple)
Oxygen (red)
Chlorine (green)

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

https://skfb.ly/6PT8q

Reference:
Crystal structure of vanadinite: refinement of anisotropic displacement parameters
F. Laufek et al.
J. Czech Geol. Soc. 2006, 51, 271-275

DOI: 10.3190/JCGS.999