The crossword solution for the term 'Alba (Gypsum)' is 'TERRA'. TERRA is a Latin word meaning 'EARTH' or 'LAND'. It is commonly used in geology to refer to the EARTH's solid surface, which is composed of soil and rock. In the context of Alba (Gypsum), TERRA refers to the mineral gypsum, which is a soft, white or grayish-white sedimentary rock composed of calcium sulfate dihydrate. Gypsum is often used in construction materials such as plaster, drywall, and cement.