Tainiolite

tainiolite

dickite

polylithionite

neptunite

Images

Formula: KLiMg₂Si₄O₁₀F₂
Phyllosilicate (sheet silicate), mica group, biotite subgroup, lithium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.83 to 2.90 measured 2.80 calculated
Hardness: 2½ to 3
Streak: White
Colour: Colourless, brownish green
Environments

Pegmatites

Tainiolite is a late-stage mineral in nepheline syenite pegmatites (Webmin, Dana, HOM).

At the type locality, the Narsaarsuk pegmatite, Narsaq, Greenland, Denmark, tainiolite is associated with quartz and dickite (HOM).

At the Lovozero massif,Russia, tainiolite is associated with natrolite, apatite, neptunite, polylithionite and manganoan pectolite (HOM).

At Coyote Peak, California, USA, tainiolite is associated with natrolite, pectolite, aegirine, barytolamprophyllite and rasvumite (HOM).

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