Zircon and haematite. Jos Plateau, Nigeria

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This is a concentrate from a river placer. A euhedral zircon (centre) shows zoning and very thin haematite (grey-white) veinlets cross-cutting the growth zones. The other zircons have porous cores with a faint red surface colour due to submicroscopic haematite inclusions (left) within well polished inclusion-free outer zones. Pare higher reflectance spots (bottom centre) within zircon are discrete haematite crystals.

Grain mount, plane polarized light, x 80, air

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