epokside

Epokside is a neologism encountered in speculative geology and in some fiction, lacking a single, officially recognized definition. It is not listed as a mineral species in major geological databases and is not part of standard mineralogical nomenclature.

The term combines epoch, indicating a significant stretch of geological or historical time, with side, implying a boundary or interface. Its usage is therefore typically figurative or hypothetical rather than descriptive of an established mineral class.

In speculative geology or world-building contexts, epokside may be described as a hypothetical mineral that forms at epoch-scale transitions and records environmental or tectonic changes through distinctive chemical or isotopic signatures. Such descriptions are speculative and not supported by peer‑reviewed evidence to date.

In narrative or game design, epokside is sometimes employed as a fictional material or plot device to symbolize temporal shifts, era boundaries, or shifts in perspective. Its properties, appearance, and uses vary by work, with no universal standard.

Because the term is informal and not widely standardized, discussions of epokside must specify the context and source. When encountered in scholarly discussion, it should be treated as speculative or fictional unless defined otherwise by the author.

See also: epoch, chronostratigraphy, mineral, boundary, time in fiction.