Chalk and seashells are made of the same thing: calcium carbonate. Shells are stronger because they have trapped proteins inside, and scientist had thought that these proteins were trapped like flies ...

RICHLAND, Wash. -- Nature packs away carbon in chalk, shells and rocks made by marine organisms that crystallize calcium carbonate. Now, research suggests that the soft, organic scaffolds in which ...

Good morning, class. Welcome to Chemistry 101. Today, we shall study the properties of calcium. I'll limit my lecture to food-related issues prompted by questions from home cooks about this element ...

You’ve probably heard of the chemical calcium in milk. But calcium shows up in lots of other stuff too. For example, the hard part of your bones and teeth is made from calcium connected to a chemical ...

Seashells and lobster claws are hard to break, but chalk is soft enough to draw on sidewalks. Though all three are made of calcium carbonate crystals, the hard materials include clumps of soft ...

Researchers used a powerful microscope that allows them to see the birth of calcium carbonate crystals in real time, giving them a peek at how different calcium carbonate crystals form. One of the ...