Craving non-food items is a temporary eating disorder called pica, which primarily affects children and pregnant women.
Pica: This Rare Eating Disorder Make Children Crave Non-Food Items Like Clay, Paper, Dirt
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Why Do People Eat Chalk, Dirt, and Other Things Not Fit to Consume?
Why is chalk not edible? Why can't I just go eat a box of chalk? - Quora
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PICA- Clay and dirt cravings — bare health studio
Craving mud, chalk could be due to iron deficiency; expert says leafy vegetables, meat rich source can reduce risk
Pica In Children: Signs, Causes, Risk Factors And Treatment
KAOLIN k 6 Pounds WHITE Dirt not Kw From the Source Georgia Not up North Where They Have None There Are No Kaolin Mines up North.
Pica (disorder) - Wikipedia
Craving Earth' Looks at Pica, the Urge to Eat Unusual Substances - The New York Times
PICA (Eating Mud) : Symptoms, Causes and Treatment