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Calabash chalk is a naturally occurring material composed of fossilized sea shells. However, it can be prepared artificially by combining clay, sand, wood ash and even salt. By molding and heating this mixture, the calabash chalk is obtained. [5] It is available as a powder, a molded shape or a block. [4] [5]
Haniyasu-hiko and Haniyasu-hime are two gods of earth, clay, and pottery in Japanese mythology. [1] [2] The two of them are collectively known by the name Haniyasu no kami. The pair are considered husband and wife as well as siblings. They are also viewed as having the same divine virtues and powers. [3] [4]
Consisting mainly of clay, sand and possibly straw, they are a 100% renewable product and contain no harmful substances. Compared to other wall coverings, they are less toxic and energy-intensive, as little energy is required in extraction, production and processing, making them attractive to environmentally conscious people.
The clay percentage may be reduced by adding sand, if available. [21] If there is more than 15% clay it may take more than 10% cement to stabilize the soil, which adds to the cost. [20] If earth contains little clay and holds 10% or more cement, it is in effect concrete.
The earth used for building ceramic houses is essentially a type of adobe with a higher clay content and fewer impurities. The earth and water are mixed until the substance has "the consistency of bread dough" [3] The clay/earth mixture is worked into forms, and the blocks dry over a period of one to two weeks.
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Swentzel is descended from a long line of Santa Clara Pueblo potters from whom she learned customary methods of pottery making. She grew up watching her mother harvest clay from the earth to create hand-coiled and pit-fired pots. [1] Swentzell began to experiment with clay as a child. She created small figurines that depicted her feelings.