Heazlewoodite, millerite, nickel arsenide. Unst, Shetland Islands, Britain

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Heazlewoodite (white, centre), the main phase, encloses a small rounded crystal of nickel arsenide (pink, lower reflectance, centre left) and is altered along fractures and grain boundaries to millerite (light yellow-brown, lower reflectance, centre right). Black areas are serpentine.

Polished thin section, plane polarized light, x 160, oil

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