Quote
FLEXIBLE STONE.—A great geological curiosity has been deposited in the museum of the Hartley Institution at Southampton, consisting of a piece of flexible stone about two feet long, seven inches wide, and more than one inch in thickness, having the appearance of rough sandstone, which bends with slight pressure like a piece of india-rubber or gutta percha of the same size. This very interesting specimen of geology has been placed in a glass case constructed for it, fitted with a lever, by touching the key of which on the outside of the case the flexibility of the stone is shown. It was presented to the Hartley Institution by Mr. Edward Cushen from his relative, Mr. R. S. Munden, who obtained it from Delhi, in the East Indies. In its natural position the stone is said to run in thin layers in the soil in which it is found, but is so rare in India that it finds a place in the museums at Calcutta. We are informed that there is a similar stone, but not so wide as the one under notice, in the British Museum, and another in the museum of the School of Mines, but specimens are very rarely to be met with. Although the stone has a gritty appearance, no grit or dust is thrown off by the motion given to it when under pressure
— Portsmouth Times and Naval Gazette, Saturday 24 August 1867 source
I wonder if Southampton University has a record of what happened to it.