Mirrored item question

Searching on poe.trade, I frequently see one person selling multiple, very similar copies of an item (usually slight variations of the same item base), all tagged as "mirrored".

Typically, these are in the 2 - 5 exalted range, wayyyy too cheap to have been created with a Mirror of Kalandra. But also way too valuable and consistent to have dropped from "of kalandra" strongboxes.

Is there some other way of crafting items that would give them the "mirrored" tag besides a Mirror of Kalandra? What the hell is up with these?

EDIT: Question answered. It's fractured fossils, which I didn't know existed (I took a couple year break and there's tons of new stuff).

there is a prophecy where shitty items drop and it has "mirrored" on it because more than one drop at the same time

https://pathofexile.gamepedia.com/Kalandra%27s_Craft

they could also possibly be from Fractured Fossils.

fossils will reroll most of the mods (keeping enchantments and fractured mods), and people do use them to make cheap Enchanted helms.

Ah, fractured fossils are what I was looking for. Same base item (aura effect cluster jewels with 6 passives, which are valuable regardless of the explicit mods) with randomized stats, all mirrored.

Strange that nobody answers "Strongboxes".
These could drop mirrored items, most times a original and 1 copy.
And like most drops bad items - nothing worth 1 exalt.

If you can get 3 rare items with the same name you can sell it to vendor,
so these items have a little use.

"

Jerexil wrote:

Strange that nobody answers "Strongboxes".
These could drop mirrored items, most times a original and 1 copy.
And like most drops bad items - nothing worth 1 exalt.

If you can get 3 rare items with the same name you can sell it to vendor,
so these items have a little use.

he answered strongboxes in the opening post. and later we find out that the item in question is a cluster jewel, which cannot drop from strongboxes.

so, strongboxes are not the answer to 'what made this mirrored item?'

"

Jerexil wrote:

Strange that nobody answers "Strongboxes".

It is strange... It's almost as if most people actually read the question in full instead of blurting out the most obvious answer.