Heazlewoodite, pentlandite, magnetite an native copper. Unst, Shetland Islands, Britain

Click here


Heazlewoodite (white, top) is intergrown with pentlandite (brown, with cleavage, centre) and rounded magnetite (light brown-grey, left) crystals, in a dunite. Minor amounts of magnetite also occur along fractures within pentlandite (bottom left, bottom centre) as a very characteristic intergrowth. Trace amounts of native copper (centre left) within magnetite are present but have tarnished to an orange colour. Dark grey areas are secondary silicates.

Polished thin section, plane polarized light, x 80, air

Click here for Associations Click here for Mineralogy Click here for high-res image (~300K)