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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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