Iron(II) oxide (FeO), after being mined, is let matured for 3 years to turn to Iron (Ⅲ) hydroxide (Fe(OH)3), which has the high coupling power with various gases and toxic substances.  Such adsorption power is used in diversified fields.

※Please note that there are also elements contained within the ingredients, such as titanium and potassium ,which cannot be easily measured due to their extremely small quantity.
Component Analysis by:
Kumamoto Industrial Research Institute ; Kumamoto Pharmacist Association Test Center

Limonite is not only rich in iron but also contains various minerals, including calcium and magnesium, in good balance. Because of this fact, it is used as livestock feed and a supplement for pet animals, and for soil improvement and water purification.