mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Hardness: 2.5-3.5 (Mohs scale), Color: Pink, lilac, or purple, Luster: Vitreous to pearly, Crystal structure: Monoclinic (micaceous), Cleavage: Perfect basal (one direction)
- Hardness
- 2
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Physical properties
Hardness: 2.5-3.5 (Mohs scale), Color: Pink, lilac, or purple, Luster: Vitreous to pearly, Crystal structure: Monoclinic (micaceous), Cleavage: Perfect basal (one direction)
Formation & geological history
Commonly formed in granite pegmatites and high-temperature hydrothermal veins. It is a secondary source of lithium and often associated with other lithium minerals like spodumene and tourmaline.
Uses & applications
A major source of lithium used in rechargeable batteries, glass, and ceramics. Also used as a decorative stone for carving, jewelry (cabochons), and for healing stone collections.
Geological facts
Lepidolite is known as the 'peace stone' due to its high lithium content, which is used in mood-stabilizing medications. It is one of the primary mica group minerals.
Field identification & locations
Identify by its characteristic purple/lilac color and soft, flaky micaceous structure. Commonly found in Brazil, Canada (Tanco Mine), Madagascar, and the USA (California, Maine). Collectors value bright color and large crystal scales.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock