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A purple Amethyst and colourless Quartz cabochon from Minas Gerais, Brazil with Goethite 'organ pipe' inclusions.
The Goethite crystals, in the form of fan-like sheaves, are arranged in parallel rows across the face of the stone, their golden metallic lustre adding to the allure of this charming gem.
Image 5 is a magnified view of the inclusion scene.
These inclusions are sometimes referred to as 'Cacoxenite', although this is a commercial name which is based on an early scientific mis-identification.
weight: 15.28 carats
shape: Tongue shape cabochon
dimensions: 29.58 x 14.03 x 4.35 mm