Eirikite

eirikite

eudialyte

catapleiite

Formula: KNa₆Be₂(Si₁₅Al₃)O₃₉F₂
Phyllosilicate (sheet silicate), leifite group
Crystal System: Trigonal
Specific gravity: 2.59
Hardness: 6
Streak: White
Colour: White to colourless
Solubility: insoluble in hydrochloric acid
Environments

Pegmatites

Localities

At the type locality, the Eudidymite - Epididymite locality, Vesle Arøya, Langesundsfjorden, Larvik, Vestfold, Norway, eirikite is a late-stage hydrothermal mineral in a dike of nepheline syenite pegmatite (HOM).
It occurs as finely or coarsely fibrous, monomineralic aggregates up to several centimetres across, associated with microcline, zircon, aegirine, polylithionite, albite, eudialyte, catapleiite and pyrochlore (HOM, Mindat).
Eirikite from the eudidymite-epididymite locality _ Image

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