Haematite, gibbsite, boehmite and TiO2 mineral. Gove, Northern Territories, Australia

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An angular haematitized clast comprises banded haematite (white, centre left) with variations in reflectance that are related to grain size and crystallinity of the haematite. The dark brown-grey matrix is a mixture of gibbsite and boehmite. All three minerals were confirmed by X-ray diffraction. A single rounded grain of a TiO2 mineral (white, highest reflectance, centre left) lies close to a polishing pit (black).

Polished block, plane polarized light, x 40, air

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