| Elemental::Block | A qualified value representing a periodic table block |
| Elemental::Category | A category of properties of the chemical elements |
| Elemental::color | A color description |
| Elemental::color_value_base | A base class for qualified values which have representative colors |
| Elemental::ColorValue | A qualified value representing a display color |
| Elemental::Element | A chemical element |
| Elemental::EntriesStream | An adapter for the display of value entries on an output stream |
| Elemental::EntriesView | An interface for the display of value entries |
| Elemental::Event | A qualified value representing the time and location of an event |
| Elemental::LatticeType | A qualified value representing a Bravais lattice type |
| Elemental::Message | A qualified UTF-8 string value that requires translation |
| Elemental::Phase | A qualified value representing a phase of matter |
| Elemental::Property< T > | A typed property of the chemical elements |
| Elemental::Property< Float > | A floating-point property of the chemical elements |
| Elemental::PropertyBase | A property of the chemical elements |
| Elemental::Series | A qualified value representing a chemical series |
| Elemental::Value< T > | A qualified value of a generic type |
| Elemental::value_base | A base class for qualified values |
| Elemental::ValueList< T > | A qualified list of values of a generic type |
1.5.6