What gems are rock crystals?

[Cortec]

Hello, trying to set up stockpiles to make clear glass but also to cut gems (the ones I can't make crystal glass with) but I can't figure out which of the gems are rock crystals.
I looked up the wiki but it gives a long list in different categories and I'm not sure whether that's a full list of gems, the gems that can be used to make crystal glass or both.

Anyone?
Thanks in advance!

EDIT: Typo clear glass changed to crystal glass

[Baalthoros]

Rock crystal is one specific gem. So if you don't want to have them cut then make you jeweler shop only accept from a specific stockpile, then set that stockpile to take all gems besides rock crystal.

Also clear glass doesnt need rock crystal, it just needs sand and pearlash. Pearlash is made at a kiln from potash. Potash is made at the ashery from ash. Ash is made at the wood furnace. Clear glass takes a lot of steps, but if you have access to wood and sand you can make it infinitely.

[Cortec]

Sorry I meant crystal glass, not clear glass. Typo

[Baalthoros]

Then yes, it is just one of the very many gems in game. You may not be able to get it on your map, but you can try to request it from the mountainhome when they show up for the trade agreement for the year.

[Cortec]

ahh ok lol thanks