The Small Vitreoasis is a naturally spawning object exclusive to Don't Starve Together. It is common (and exclusively found) in Lunar Grotto biome.
It is a smaller version of the Vitreoasis, only containing 1 Moon Glass structure.
Trivia
The Vitreoasis and Small Vitreoasis were introduced in the Forgotten Knowledge update.
Appears to be portmanteau of words "vitreous" and "oasis".
"Vitre" is a French word used for objects made of or possessing qualities of "glass".
Judging by many quotes, these glasses are formed due to water saturated with lunar dirt. In the Scrapbook for Small Vitreoasis it is already specified that this happens only in certain light.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/DLC/function/tags of these Things. Some of them are not even.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/DLC/function/tags of these Things. Some of them are not even.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/DLC/function/tags of these Things. Some of them are not even.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/DLC/function/tags of these Things. Some of them are not even Structures.