Normandite from the famous Khibiny region in Russia. — Photo: David Hospital · CC BY-SA 4.0
Normandite
An orange-brown sorosilicate of the wöhlerite group — the titanium analogue of låvenite.
Intro adapted from Wikipedia (CC BY-SA).
Normandite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂Ca₂(Mn,Fe)₂(Ti,Nb,Zr)₂(Si₂O₇)₂O₂F₂.
It crystallizes in the monoclinic crystal system (space group P2_1/a). It is a member of the Wöhlerite structural group.
IMA symbol Nmd, IMA status: approved, named in 1990.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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