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 uneven fracture. It has a hardness of approximately 5.5 on the Mohs scale and a specific gravity of around 4.5. Rubriikkia is often found in small, compact crystals or as granular masses.

The discovery of rubriikkia has contributed to the understanding of manganese oxide mineralogy and the geological processes that lead to their formation. Its rarity and distinctive properties make it a subject of interest for mineral collectors and researchers alike. Despite its unique characteristics, rubriikkia remains relatively unknown outside of specialized mineralogical circles.