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Lepidolite
Chemical Formula	KLi2Al(Al,Si)3O10(F,OH)2
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	2-3
Specific Gravity	3.11
Color	Pink, purple, rose-red, Purple-gray, yellowish, white, colorless
Streak	White
Luster	Sub-Vitreous, Resinous, Greasy, Pearly
Refractive Index	nα=1.525–1.548, nβ=1.551–1.58, nγ=1.554–1.586
Diaphaneity	Transparent, Translucent
Cleavage	Perfect perfect
Fracture	Micaceous
Crystal Habit：Tabular to prismatic pseudohexagonal crystals, scaly aggregates and massive
Geological Setting：May be found in aplites associated with granite pegmatite. rarely found in hydrothermal veins and extremely rarely in granite contact zones.

Lepidolite (KLi₂Al(Al,Si)₃O₁₀(F,OH)₂ is a lilac-gray or rose-colored polylithionite-trilithionite series, a phyllosilicate mineral series 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. In 1861 Robert Bunsen and Gustav Kirchhoff extracted 150 kg of lepidolite and yielded a few grams of rubidium salts for analysis, and therefore discovered the new element rubidium.

It occurs in granite pegmatites, in some high-temperature quartz veins, greisens and granites. Associated minerals include quartz, feldspar, spodumene, amblygonite, tourmaline, columbite, cassiterite, topaz and beryl.

Notable occurrences include Brazil; Ural Mountains, Russia; California, United States; Tanco Mine, Bernic Lake, Manitoba, Canada; and Madagascar.