Selected Minerals – Today: Adamite

Adamite

• Named after the French mineralogist Gilbert-Joseph Adam (1795 – 1881)
• Typically occuring in weathered zones above zink ores
• Formula: Zn₂(OH)(AsO₄)
• Space group: Pnnm (No. 58)
• Crystal system: orthorhombic
• Crystal class: mmm
• Lattice parameters: a = 8.30 Å, b = 8.51 Å, c = 6.04, α = β = 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):

AsO₄ tetrahedra (green), ZnO₆ octahedra (gray)

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