Calcite, Citrine, Adventurine or None of The Above?

[Tom Bombadil]

I seem to have a bit of yellow/orange calcite and some of it seems to have some iridescent or opalescent qualities when polished. This triangular piece was found triangular, and I did a small amount of polishing to let more light in. I still have a bit of work to do and I need to spend more time in the garden if I'm honest.

There are countless folks on here are much smarter than I am so I wanted to ask-what do you all think these are?