Kaseïnen
Kaseïnen is a term used in speculative fiction to denote a rare mineral with notable energy-related properties. Because it appears across multiple works, there is no single canonical definition, and the precise details vary by author.
In many depictions, kaseïnen crystals are prismatic and translucent, typically blue to violet, with a glassy
Geology within the fiction places kaseïnen in high-temperature environments, often forming in deeply buried pegmatites, metamorphic
Applications center on energy and technology. Kaseïnen is frequently depicted as an efficient energy storage medium
Etymology: the name kaseïnen is fictional and varies by universe. The spelling with the diaeresis is used