What grammatical structure is the italicized portion of the sentence?

My most valuable coin, one from Spain, is worth more than $100.00.

What are the italicized words?

i think its about the whole thing or like the part that is,then what is the structure of it

Your question asks only about the part that is italicized.

Is this the way your sentence looks?

My most valuable coin, one from Spain, is worth more than $100.00.

yes, and i think if its the whole sentence then its just asking what is the structure of it

The italicized part is an appositive.

http://www.chompchomp.com/terms/appositive.htm

thank you and i have a few more to do the next one is:We walked along the mountain path looking for unusual flowers. so it would be nominative absolute?

What part of the sentence do you think is the nominative absolute?

looking for unusual flowers

Yes, you're right.

:) By mistake I opened a package addressed to my sister. is the next one and would be infinitive phrase?