This rock sample was brought back from the summit of Mount Everest by a team of climbers representing the Japan Mountaineering Association; two members of this team, Matsuura and Uemura, reached the 8,848-metre summit of the world's highest mountain on May 11th, 1970. The rock was displayed in the Matsushita Pavilion at Expo '70 from June 28th. Its smooth and colourless surface clearly shows its neptunian origin, suggesting that in the primaeval period the summit of Mount Everest was below sea level.