Ferroinnelite

ferroinnelite

cancrinite

magnesio-arfvedsonite

golyshevite

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Formula: Ba4Ti2Na(NaFe2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)]
Sorosilicate (Si2O7 groups), lamprophyllite group, seidozerite supergroup
Crystal system: Triclinic
Specific gravity: 4.088 calculated
Hardness: 5
Streak: White
Colour: Yellow to yellow-brown
Environments

Pegmatites
Hydrothermal environments

Ferroinnelite is a new mineral, approved in 2024 and pending publication in May 2025

Localities

At the type locality, the Kovdor Phlogopite mine, Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia, ferroinnelite occurs as transparent brown crystals to ~0.15 mm in size in hydrothermally altered agpaitic pegmatite. It is one of a very small number of minerals that bears Ti4+ in fivefold coordination. Other minerals with fivefold-coordinated Ti include fresnoite, alfredcasparite, and other members of the lamprophyllite group, such as innelite. The IMA formulae for some other lampyophyllite group minerals, including shkatulkalite and zvyaginite, contain essential H2O groups.
Associated minerals include cancrinite, orthoclase, aegirine-augite, magnesio-arfvedsonite, golyshevite and fluorapatite (AM 110.5.829, Mindat).

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