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Wikipedia Mortar (masonry) – Wikipedia, The Free Encyclopedia
In later Egyptian pyramids, the mortar was made of either gypsum or lime. Gypsum mortar was essentially a mixture of plaster and sand and was quite soft. … Read Article

Wikipedia Gold – Wikipedia, The Free Encyclopedia
Gold is a chemical element with the symbol Au (from Latin: aurum "gold") and an atomic number of 79. Gold is a dense, soft, shiny, malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water … Read Article