Pyramidal alstonite crystal

Scanning electron micrograph of a pyramidal alstonite (larger crystal) with smaller, doubly-terminated paralstonite crystals, from Dolyhir Quarry.

Discover more of these remarkable images on the Crystals and Minerals online gallery on 'Rhagor', the collections based website from Amgueddfa Cymru - National Museum Wales.

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Electronmicrograff sganio o grisial pyramidaidd alstonit (y crisial mwyaf) ynghyd â chrisialau pennau dwbl, llai o'r mwyn paralstonit, o Chwarel Dôl-hir.

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