About the chemical structure:
| Chemical name: | calcium carbonate |
| Formula: | CaCO3 |
| 3D model: |
grey = carbon, red = oxygen, blue = calcium |
| Crystal system: | Trigonal - Hexagonal Scalenohedral (at Mineralogy Database) |
| Refractive index: | calcite: e =1.486, w =1.64 -1.66 |
How can you identify Chalk?
Chemical identification:
n/a
Usage and handling:
| Permanence: | Toxicity: |
|---|---|
| excellent lightfastness, incompatible with alkali-sensitive pigments such as Prussian blue. | non toxic |
Literature:
Artists’ Pigments. A Handbook of Their History and Characteristics, Vol. 2: A. Roy (Ed.) Oxford University Press 1993, p. 203-226
Sections: 