Does chalk have calcium?
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                            Chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite.. 
                    
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                                   Eating chalk often can disrupt your digestive system and cause damage to your internal organs. Complications of eating chalk consistently may include: tooth damage or cavities. digestive difficulties. 
                                
                            
                        
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                            Chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite.. 
                        
                    
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