From a historic mine in England, this is a great surviving specimen of green fluorite cubes arranged three dimensionally upward on matrix. The Heights Mine was worked primarily for iron ore between 1850 and 1868 by the Weardale Iron Company. The vein diggings showed many vugs of clear, purple, or green fluorites which were often twinned. Amateur collectors worked the area for decades, but the area was deemed dangerous and the mine was sealed in 1970, although further quarrying has exposed some areas since then. The cubes on this piece are nearly water clear and have a green to teal cast in many lights This fluorite is from an old stock and dramatically shows its interpenetrant twins.