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Articles called Recipe for Adobe Bricks, and History of the adobe building in the August 21, 1996 San Francisco Chronicle describes making adobe bricks from the most basic resources - sunshine, water, straw, and sand. The Earth Architects site also provides information. The article states, in part:

Home brickmakers may need to experiment to find the right balance of ingredients. ... "The consistency of the brick mixture should be halfway between pancake batter and stiff cookie dough," advises Robert Pedritti, site director at San Jose's Peralta Adobe and Fallon House. Pedretti shares the following adobe brick recipe:

Recipe for Six Adobe Bricks

Time required: about one month (most of it waiting for bricks to dry).
Cost: little or nothing


Adobe is derived from the Arab word, "at-tub," referring to the earth bricks Arabs made as early as 7000 BC. With the mingling of the Arab and Spanish cultures, "at-tub" evolved into "adob." And when the Spanish and American Indian cultures combined in California, the word became "adobe". ... The outer walls were first smeared with a thick coat of adobe mud and then a coating of white lime plaster, made from baking seashells in a fire. Each year, a fresh coat of plaster was applied to cover cracks and fallen chunks. The wall thickness of California adobes varied from about two feet to five feet. The higher the walls, the thicker they were built. Because of this thickness, the inside temperature of an adobe remains fairly constant and comfortable year-round.