In the Kaguya arc of the manga (which was the basis for the Sailor Moon S Movie), Sailor Neptune, Sailor Uranus and Sailor Pluto perform an unnamed move using Sailor Neptune's Deep Aqua Mirror.

They use the Deep Aqua Mirror to locate the comet which had disappeared from radars, that's heading towards Earth and then use it to teleport them to the comet. It appears to be a Sailor Teleport kind of move, however because they don't know their destination, they have to use the mirror as their targeting system.

Something interesting to note is that they actually travel into the mirror when teleporting as if the mirror itself is the doorway.
Once at the commet though and transformed, Sailor Neptune is shown holding the mirror in her hand suggesting it disappeared once they went through it and materialised in her hand.

When Snow Princess Kaguya attacks Neptune, Uranus and Pluto, they're teleported back through the mirror to where they came from and the mirror shatters. It's open to speculation if they were sent back because their concentration was broken, if they deliberately retreated because they were no match for Kaguya or if Kaguya herself sent them back.

Thanks to Mike Yang for asking this question via email.

His original phrasing of the question was "So recently I've been reading the manga and in the chapter where Snow Princess Kaguya appears, Neptune does something with her mirror that I can't tell is astral projection or teleportation. Your thoughts?" though I simplified it to fit the format.

Hope this answers your question, Mike!

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