Ca2tasoja

Ca2tasoja is a coined term used in Finnish-language speculative mineralogy and science fiction to denote a hypothetical class of calcium-rich minerals with a bilayered crystal structure. The name blends the chemical symbol for calcium (Ca) with tasoja, Finnish for levels or layers. There is no single, official definition; different authors have proposed varying compositions and arrangements.

Conceptual descriptions often present Ca2tasoja as comprising two distinct interleaved layers containing calcium ions, with anions such as carbonate, sulfate, or silicate forming a stable sheet framework. Because it is a fictional or speculative construct, real-world chemical formulas and crystallography vary by source. Reported properties in narratives include a pearly to vitreous luster, a hardness on the Mohs scale that ranges from about 3 to 6, depending on the imagined stabilization, and distinct cleavage along the layered planes. Some writers assign luminescent or iridescent behavior to cleavage surfaces.

Context and usage: Ca2tasoja appears mainly in world-building exercises, role-playing games, and science-fiction stories. In these contexts, it is sometimes described as forming in high-temperature hydrothermal environments or in calcium-rich planetary crusts, and it is occasionally portrayed as a resource with potential for energy storage or lightweight structural material.

Status: Not recognized by professional mineralogical catalogs or standard reference works. As a term, it serves as a narrative device rather than a scientifically validated mineral. References to Ca2tasoja appear in fan wikis, forums, and speculative-fiction anthologies.

See also: Calcium minerals, Layered minerals, Fictional minerals.