Chalk - If you put chalk under a powerful microscope—white cliffs of Dover type of chalk, not the modern blackboard variety—you will see something like this. Because it's not just a rock.
![Emma Hollen on X: "These are some of the things you might see if you put a speck of natural chalk in an electron microscope: the shells and skeletons of diatoms, radiolarians, Emma Hollen on X: "These are some of the things you might see if you put a speck of natural chalk in an electron microscope: the shells and skeletons of diatoms, radiolarians,](https://pbs.twimg.com/media/EdhIODZXoAAIm71.png)
Emma Hollen on X: "These are some of the things you might see if you put a speck of natural chalk in an electron microscope: the shells and skeletons of diatoms, radiolarians,
![Chalk under a microscope......if you ever wonder why i like using chalks to make pigments just look! Chalk under a microscope......if you ever wonder why i like using chalks to make pigments just look!](http://www.hunterdelves.com/uploads/4/5/8/0/4580351/natural-chalk-under-microscope_orig.jpg)
Chalk under a microscope......if you ever wonder why i like using chalks to make pigments just look!
![Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry. Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry.](https://s3-eu-west-1.amazonaws.com/ppreviews-plos-725668748/1549564/preview.jpg)
Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry.
![Shower Thoughts on X: "Get a tiny speck of chalk (Calcium Carbonate), put it in an electron microscope, and this is what you'll see. http://t.co/I4V2ALMVnc" / X Shower Thoughts on X: "Get a tiny speck of chalk (Calcium Carbonate), put it in an electron microscope, and this is what you'll see. http://t.co/I4V2ALMVnc" / X](https://pbs.twimg.com/media/BUh6MD_CcAEhOzv.jpg)
Shower Thoughts on X: "Get a tiny speck of chalk (Calcium Carbonate), put it in an electron microscope, and this is what you'll see. http://t.co/I4V2ALMVnc" / X
![The Echinoblog: The Ocean's Holiday Tree Ornaments! Stunning Scanning Electron Microscope Pictures of PLANKTON! The Echinoblog: The Ocean's Holiday Tree Ornaments! Stunning Scanning Electron Microscope Pictures of PLANKTON!](http://farm8.staticflickr.com/7057/6908938729_5dbdaf149c_o.jpg)