Yellow crystals of the very rare Na-Fe carbonate-sulphate mineral ferrotychite from the TL in Khibiny (Olenii Ruchei, Khibiny Massif, Murmansk Oblast, Russian Federation) and only one of the two known localities worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Ferrotychite
Ferrotychite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Na₆Fe²⁺₂(CO₃)₄(SO₄).
It crystallizes in the cubic crystal system (space group Fd3). It is a member of the Northupite structural group.
Key properties: Mohs hardness 4; specific gravity 2.79; Vitreous luster.
IMA symbol Ftyc, IMA status: approved, named in 1980.
A rare constituent of a vein cutting ijolite-urtite in an alkaline igneous complex, from a drill core.
It is found associated with Shortite, bonshtedtite, analcime.
The name refers to essential FERROus iron and the relation to tychite.