Achromatium is a genus in the phylum Pseudomonadota (Bacteria).

[4] The name Achromatium derives from:Greek prefix a- (ἄ), not; Greek noun chroma, color, paint; Neo-Latin neuter gender noun Achromatium, that which is not colored.

[5] The genus contains single species,[5] namely A. oxaliferum ( Schewiakoff 1893, species.

(Type species of the genus).

; Latin oxalis from the Greek noun oxalis (ὀξαλίς), meaning sorrel, a toxic plant due to oxalic acid production; Latin v. fero, to carry; Neo-Latin neuter gender adjective oxaliferum, oxalate-containing.