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My speculation is that if you try to use ma% or mas%, you will be asked to change it to wt%, because what you are proposing is not yet standard usage. If I came across ma%, my initial though would be "what does that mean". My second thought would be, "does it mean milli annums percent?", (thousandsths of a year percent) - which would be meaningless to me. ...


4

Olivine is a solid solution between forsterite and fayalite, so it is generally expressed as molar percentages of these end-members, for instance Fo80Fa20. Often only one end-member is mentioned, as it is sufficient to infer the other (their sum is always 100 %). It is the same with plagioclase, which is a solid solution between albite and anorthite and is ...


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