Pink Tourmaline (Rubellite) in Lepidolite
Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4) in Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Rock Type: igneous
Physical Properties
Hardness: 7-7.5 (Tourmaline), 2.5-3 (Lepidolite); Color: Pink to magenta crystals in a lilac or lavender matrix; Luster: Vitreous to pearly; Crystal structure: Trigonal (elongated prisms) for tourmaline, Monoclinic for lepidolite; Cleavage: Indistinct in tourmaline, perfect micaceous in lepidolite.
Formation & Geological History
Formed in lithium-rich granitic pegmatites during the late stages of magmatic crystallization when volatile elements like lithium and boron are concentrated. Often found in Precambrian and Paleozoic pegmatite fields.
Uses & Applications
Major source of lithium ore (from lepidolite), high-quality tourmaline specimens are used in jewelry and decorative carvings, and rough slabs are popular for metaphysical and lapidary collecting.
Geological Facts
Lepidolite is the most common lithium-bearing mineral and was once the primary source of the element. Pink tourmaline owes its vibrant color to trace amounts of manganese within its crystal structure.
Field Identification & Locations
Identify by looking for the 'sparkly' purple-lavender micaceous matrix (lepidolite) containing distinct, elongated pink hexagonal prisms (tourmaline). Common locations include Minas Gerais (Brazil), Pala District in California (USA), and various localities in Madagascar.
Identified on: 4/13/2026
Mode: Standard