Rowan's* calcite + Mi chiastolite = Citrine

They wouldn't stay fused for long since chiastolite would be super embarrassed having to be in some foreign body. Especially with someone else sharing it.

I'll probably do at least two more fusions.

*I'm afraid I can't publicly link their URL for my safety. I checked with them and they said it was okay that I used just their name for this.