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A spectacular amethyst heart for all my followers

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What a geode

Just to give you an idea of scale as it sits pretty on its pallet, the yellow calcite blade that grew within the cavity from a second generation of mineralised fluids (this one carbonate rich) is a metre or so long. Weighing in at over a metric ton and a half it originally formed as a large bubble in a basaltic lava, which remains as the greyish outer layer of the extracted piece. The hydrothermal system created by the interaction between the heat of the cooling lava and infiltrating groundwater mobilised silica and precipitated it as the first generation of gleaming amethyst crystals lining the inside of the cavity.

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