Millerite is nickel sulphide, NiS. The specimen is from waste heaps at Marine colliery, Ebbw vale, South Wales. Millerite is widespread throughout the south Wales coalfield, which was deposited during the late Carboniferous period. The specimen is quite small compared to others which have been found at this site, but it is the largest of the ones that I found. The acicular radiating needles are in a very small vhug of siderite. The photo is the best that I can manage with my meagre equipment, and will be replaced at a future date.