Question about Compound Notation

[AcidRainLiTE]

Hello,
I have a question about notation.
What does it mean when you have two elements in parentheses separated by a comma? For example,
(Zn, Cd)S

Also, what do elements which come after a colon mean? Specifically,
(Zn, Cd)S: Cu, Al

Thanks.

 

[lightarrow]

Hello,
I have a question about notation.
What does it mean when you have two elements in parentheses separated by a comma? For example,
(Zn, Cd)S

This should mean: sulfide of Zn and Cd (atoms of Zn and atoms of Cd in the same crystal of sulfide).

Also, what do elements which come after a colon mean? Specifically,
(Zn, Cd)S: Cu, Al

Thanks.

Don't know this one; maybe it means: in a solution containing copper and aluminum ions.

 

[wil3]

Is this maybe some sort of electrochem cell diagram format?