Is there a list of stabilizers for the Infusion Altar from all mods? I cannot search the term, "Infusion Stabilizer," in JEI for all blocks that act as stabilizers; nothing appears in the JEI.

The list is incomplete. Sconces from Rustic Thaumaturgy also are Infusion Stabilizers; it's possible that Pyritie doesn't have that installed on any packs. I believe each type of sconce counts as an individual stabilizer as well, just like the candles and crystal blocks.

it might depend slightly on the mod pack, but there's a pinned message in the MC Eternal discord that says:

Minecraft
All heads

Thaumcraft
Arcane Pedestal*
All candle colors
Stabilizer*
Redstone Inlay*

Thaumic Additions: Reconstructed
All vis Crytal Blocks

Thaumic Augmentation
Ancient Pedestal*
Eldritch Pedestal*

Botania
Mana, Nature, and Gaia Pylons
All Glimmering Flowers
All Floating Flowers
All Shimmering Mushrooms

Bewitchment
All candle colors

Ice and Fire
Fire and Frost Lilies

The Twilight Forest
Firefly Jar
Trophy Pedestal

~~ You can only have a maximum of 20 of a stabilizer to contribute to stabilizing the Infusion Altar. In addition, you may use different candle colors. For example, 20 white candles and 20 orange candles from Thaumcraft will contribute to the stability of the altar. ~~

• Any item marked with an asterisk has additional effects.

Right now the "infusion stabilizer" text is just a tooltip, not anything registered with JEI. Doing that would probably be a good idea. Thank you for posting the list of items though!

Bewitchment's Candelabra also can be used as stabilizers too, not just the single Candles.

And I'm not sure if this is from the mod itself, or another one is making things work this way, but Thaumic Bases Unofficial also have stabilizers:

• All the 8 Crystal Blocks

  • Air Crystal Block
  • Fire Crystal Block
  • Water Crystal Block
  • Earth Crystal Block
  • Order Crystal Block
  • Entropy Crystal Block
  • Primal Crystal Block
  • Tainted Crystal Block

• All the 8 Ancient Blocks

  • Ancient Lapis Lazuli Block
  • Ancient Iron Block
  • Ancient Gold Block
  • Ancient Diamond Block
  • Ancient Cobblestone
  • Ancient Mossy Cobblestone
  • Ancient Gravel
  • Ancient Bricks

• All the 6 other Decorative Blocks

  • Block of Thauminite
  • Quicksilver Block
  • Quicksilver Bricks
  • Iron Framed Greatwood
  • Gold Etched Obsidian
  • Salis Mundus Block