Weird green gel-like substance found on the moon finally identified - CNET

An image of the crater where the "gel like" substance was found.

It's rock, more specifically "impact melt breccia." Breccia is rock made up of fragments of rocks or minerals cemented together, like a geologic version of one of those Jell-O salads packed with fruit bits.

"It was formed by impact-generated welding, cementing and agglutinating of lunar regolith and breccia," the team reported. .

"Glasses in the lunar regolith are usually sourced from impact melts or from volcanic eruptions," the study said.

The study also found the melted rock resembles lunar impact melt breccia samples returned by NASA's Apollo moon missions. .