Orange-Red like Saffron: Crocoite

Crocoite

• The name crocoite comes from the Greek “krokos” = saffron, alluding to the saffron-orange color of its powder
• Formula: PbCrO₄
• Space group: P2₁/n (No. 14)
• Crystal system: monoclinic
• Crystal class: 2/m
• Lattice parameters: a = 7.127 Å, b = 7.438 Å, c = 6.799 Å, α = 90°, β = 102.43°, γ = 90°

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Picture: Juergen Merz – http://www.mindat.org/photo-360746.html
(This image has been released to the public domain.)

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Crystal structure (click on the pictures 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 a axis.

Gray: Pb, red: O, orange: CrO₄ tetrahedra

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