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March 27, 2026Mineralogy and PetrologyOpen Access

Origin of violet colour in agates from Chihuahua, Northern Mexico

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Authors

JGJens GötzeMMMaximilian MrozikMDMadison DeCorby

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Overview

Geochemical analyses uncover the source of violet color in agate bands, indicating unique iron behavior.

Key Points

  • The aim is to identify the source of violet color in agate samples from Chihuahua, Mexico.
  • Conducted trace element analyses using ICP-MS.
  • Detailed optical absorption and EPR spectroscopy performed.
  • Cathodoluminescence microscopy used for visualization.
  • Annealing treatments applied to study color changes.
  • Violet color attributed to Fe4+ color centre similar to amethyst.
  • Confirmation of absorption bands characteristic of amethyst.
  • High uranium concentrations and uranyl ions detected in violet bands.
  • Annealing treatments completely bleached the violet color.

Cite This Study

Götze et al. (2026) studied this question.

synapsesocial.com/papers/69c620d515a0a509bde197abhttps://doi.org/10.1007/s00710-026-00977-x
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