Rubriikkia
Rubriikkia is a rare and unique mineral species discovered in 2006. It is named after the Finnish word for "red," reflecting its distinctive red color. Rubriikkia is a complex oxide mineral with the chemical formula (Na,Ca)2(Mn,Fe)4O8. It typically forms as a secondary mineral in altered manganese-rich rocks, often in association with other manganese oxides such as hausmannite and braunite.
The mineral exhibits a reddish-brown to dark red color, with a metallic luster and a conchoidal to
The discovery of rubriikkia has contributed to the understanding of manganese oxide mineralogy and the geological