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

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Small crystals of nickel arsenide (pink-brown, top right, centre left) are included within heazlewoodite (cream-white, centre) which is the main phase. Heazlewoodite shows multiple twinning along (0221) (bottom left) and alteration to lower reflectance, yellow millerite (bottom right) along a north-south oriented fracture. Black areas are silicates.

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

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