Tainiolite

mica

pegmatites

Formula: KLiMg2Si4O10F2
Phyllosilicate (sheet silicate), mica group, biotite subgroup
Specific gravity:
Hardness: 2½ to 3
Streak: White
Colour: Colourless, brownish green
Solubility:
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 CoyotePeak, California, USA, tainiolite is associated with natrolite, pectolite, aegirine, barytolamprophyllite and rasvumite (HOM).

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