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A cluster of pyrite crystals. The entire surface is covered in near-microscopic growth lines where new crystals were once beginning to form.

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Hematite crystals sitting upon long edenite crystals. Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Large osumilite crystal within a tridymite-lined miarolitic cavity. Mt Ngongotaha, New Zealand.

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Electron microscope image showing striations on the face of a quartz crystal.

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Pyrite cubes.

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Phillipsite, Kulnura, Australia.

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White mullite needles and hematite in a tridymite-lined miarolitic cavity. From Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Small pseudobrookite crystal cluster on tridymite. From Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Scanning Electron Micrograph of a titanite crystal sitting on a hematite crystal. A secondary phase of hematite growth forms triangular spirals around the titanite. From Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Scanning Electron Micrograph of clustered hematite crystals, measuring approximately 1mm across. From Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Karijini National Park, Western Australia.

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Translucent phlogopite mica inside a tridymite-filled miarolitic cavity. Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Iridescent fayalite crystal on tridymite. Mt Ngongotaha, Taupo Volcanic Zone, New Zealand.

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Tiny, bladed crystals of pseudomalachite from Suloga, PNG.

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Karijini National Park, Western Australia.

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Goblin’s Cave

(pseudomalachite from Suloga, PNG)

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Patchwork blanket calcite from Western Australia, as seen in thin section under cross-polarised light.