You can get some sense of scale from this sunset photo of my shadow against the crystals. Some of these things are several meters on a side. They topple over out of the vertical crystal formation in the background, forming quite a jumble of multi-sided blocks.
This part of the US has a lot of alien-sighting loonies, so I couldn’t resist. The “egg chambers” are actually water cistern holes eroded in a cave floor by the early indigenous people.
The full Pena Blanca formation with the darker Organ Mountain chain in the background.