a very unique specimen of millerite from Newbridge Colliery, Gwent, South Wales
|Origin||Newbridge Colliery, Gwent, South Wales|
Millerite has been found in cavities in coal seams by miners in the Kladno region of central Bohemia for more than a hundred years. It forms fine hair-like crystals, consisting of flexible needles, brassy yellow in colour. These needles sometimes reach a remarkable length (6 cm) and miners call them ‘golden hair’. The millerite needles can be seen only after the ball-shaped formations are broken up. Though the nickel content is nearly 56 per cent, it is never considered as a nickel ore. This is because nowhere in the world does it occur in workable quantities.