FOSS gamedev and creative worlds

Is there a way to find out what is how rare. If anyone knows of a way to easily find out could they tell me. Also if there is a list already made could you give me a link or post it here.

You mean Like this?
MESE Rare
Very Rare
Rare
Uncommen
Normal <==White

Items are the things you carry around and put into chests. I guess you what to know how rare certain nodes are that naturally occur (e.g. iron).

Yeah how the occur. Like
Nyan
mese block
Made crust
Mese frag
Iron block
Iron ingot

I never calculated it, but I suppose that in vanilla, cacti, clay, dry shrub and papyrus are the rarest nodes. They only appear in 1 layer, but don't form a layer themself. Closely followed by dirt, desert sand and normal sand, appearing in only a few layers.

Items using those materials are automatically more rare.

Edit: my typo's are common.