Täheldasite

Täheldasite is a name that has appeared in discussions of mineral nomenclature but is not recognized as a valid mineral species by the International Mineralogical Association (IMA). As of now, no peer‑reviewed description, holotype specimen, or published chemical analysis for täheldasite exists in the mineral literature. Consequently, there are no established details about its composition, crystal structure, or physical properties.

Etymology for the name is commonly linked to the Estonian verb täheldama, meaning to notice or observe, reflecting its proposed status as a newly observed mineral. The naming, however, is not standardized in reference works and may be used inconsistently by authors.

Because there is no verified material, täheldasite does not have documented localities, geological context, or associations. It is typically treated as a nomenclatural placeholder rather than an established mineral species.

In speculative discussions, täheldasite has been described as a hypothetical oxide or silicate with an undetermined formula, but these descriptions lack supporting data and are not accepted by the mineralogical community. Until a specimen is described and validated by the IMA, the name remains unofficial.

See also: Mineral nomenclature, International Mineralogical Association, Nomenclature of minerals.

References: No peer‑reviewed sources currently confirm täheldasite.