I do not need this kind of answer.Shiny <-> not shiny is probably just a result of the surface and its structure.
It is impossible to tell which elements are in those objects just by looking at them,
Where?but you can find out which materials are frequently used for those objects.
I see a different comparison:I do not need this kind of answer.
Like I asking "what kind of of tree is that?", then your answer is "It's green".
In >100 books and web pages about rims.Where?