Inosilicate (chain silicate), amphibole group
Specific gravity: 3.14 calculated
Colour: Light greenish-blue
Plutonic igneous environments
Fluoro-leakeite is formed by the reaction of alkaline granite with post-magmatic fluids
rich in lithium and fluorine. Associated minerals include cámaraite,
riebeckite, aegirine and
At the Verkhnee Espe Massif, Akzhaylyautas Mountains, Tarbagatai Range, East Kazakhstan, Kazakhstan, the granite is strongly altered by late-stage hydrothermal activity, with enrichment in fluorine, lithium and rare earth elements. Partial breakdown of riebeckite, aegirine, elpidite and astrophyllite was accompanied by the formation of fluoro-leakeite, polylithionite, quartz, rutile and fluorite (R&M 86.2.165).
At the type locality, Norra Kärr, Gränna, Jönköping, Jönköping County, Sweden, fluoro-leakeite occurs as isolated prismatic crystals to 2 mm long in an alkaline intrusion that mainly comprises nepheline syenite (Mindat).
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