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A crystalline compound of rubidium and ammonium containing two carboxylic acid groups. It is a precursor to cyanohydrins, which are used for the coloration of red ink. It also acts as a catalyst in the production of cobalt. Oxalate is found in foods containing high levels of sugar and is toxic to humans if ingested. It has been used to treat anxiety and depression, and is used as a sedative in animals.

Insoluble and thermally stable, rubidium oxalate is an ideal choice for glass, optic and ceramic applications. It is highly useful in optical systems such as lasers, optical amplifiers, photodetectors and oscillators. It is also suitable for spectroscopy applications such as vibrational spectroscopy and polarization-sensitive detection.

A yellow solid, rubidium oxalate reacts readily and exothermically with water to form rubidium hydroxide, a strong base. It is also a weak oxidizer, and readily reacts with hydrogen to form rubidium hydride. Most oxide compounds are non-conductive to electricity, but perovskite structured rubidium oxides and some other oxides exhibit ionic conductivity. rubidium oxalate is poisonous by ingestion, and may cause skin or eye burns upon contact. It is moderately toxic by inhalation. It should be handled with care and kept out of the reach of children. In case of ingestion, drink plenty of water and seek medical attention immediately. It is irritating to the eyes, and should be flushed with water. If it gets on the skin, wash it off with soap and water, and seek medical attention if irritation persists.