Lepidolite (KLi2Al(Al,Si)3O10(F,OH)2) is a lilac or rose-violet colored phyllosilicate mineral of the mica group that is a secondary source of lithium. It is associated with other lithium-bearing minerals like spodumene in pegmatite bodies. It is one of the major sources of the rare alkali metals, rubidium and caesium.

  • Physical Properties
  • Color: violet lombo pale pink to white, sometimes gray or yellow.

    Luster: vitreous to pearly

    Transparency: transparent to translucent.

    Crystal System: monoclinic; 2/m.

    Crystal Habits: include tabular to prismatic crystals with a prominent pinacoid termination. Lepidolite forms pseudo-hexagonal "books." Also as micaceous or granular masses.

    Cleavage: perfect in one direction perpendicular to the c-axis.

    Fracture: uneven.

    Hardness: 2.5

    Specific Gravity: 2.8+

    Streak: white

    Density:2.8-2.9 Average size 2.84

    Associated Minerals: quartz, feldspar, spodumene, amblygonite, tourmaline.

    Notable Occurrences: Brazil; Ural Mountains, Russia; California; Tanco Pegmatite, Bernic Lake Manitoba, Canada.

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