Here in the ancient mine at Skouriotissa which had been closed for at least 1500 years is found a most odd formation of satin spar crystals which have grown since the workings were closed. Fig. 1 is a photograph takenin the ancient drift. Fig. 2 shows a handful of the crystalls scattered on a black cloth. These long clear white, hair crystals stood out each independently, growing from the faces of the mine drift, from either top, bottom or sides. I measured one 13 inches long. Nine inches is a common length. Their diameter is from 0.05 to 0.12 millimetre; the longer hairs being commonly about 0.1 millimetre. They are somewhat flexible, the more slender bending to a half circle of one inch diameter. Some bent crystals may be seen in the photograph. Large handfuls, probably the longest and best, were gathered in bunches and brought to the office before I had a chanceto take the photograph.