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![Alchemy Alphabet: CHALK (Latin: Creta), carbonate rock, form of Limestone composed of Calcite. Calcium carbonate: Chemical formula=[CaCO₃]. Alchemical sign, Medieval symbol. Stock Vector | Adobe Stock](https://as2.ftcdn.net/v2/jpg/04/52/05/49/1000_F_452054941_SagHQJuPTGOrJQVDwCJbHpTDjReSfmYk.jpg "Alchemy Alphabet: CHALK (Latin: Creta), carbonate rock, form of Limestone composed of Calcite. Calcium carbonate: Chemical formula=[CaCO₃]. Alchemical sign, Medieval symbol. Stock Vector | Adobe Stock")
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