User:RockMagnetist (DCO visiting scholar)/Drafts/Goldschmidt classification

For each group, an "x" denotes one of the main elements while an "m" is for elements that occur in the group but mainly belong to another.

Goldschmidt (1954)
Goldschmidt's original classification.

Mason and Moore (1982)
Mason and Moore (1982) classification.

Krauskopf and Bird (1995)
Krauskopf and Bird (1995) classification.