Rock Identifier
Lepidolite and Rubellite (Pink Tourmaline) (Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2] and Rubellite [Na(Li,Al)3Al6(BO3)3Si6O18(OH)4]) — igneous
igneous

Lepidolite and Rubellite (Pink Tourmaline)

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2] and Rubellite [Na(Li,Al)3Al6(BO3)3Si6O18(OH)4]

Hardness: 2.5-3 (Lepidolite), 7-7.5 (Tourmaline); Color: Lavender, lilac, pink; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (Mica) and Trigonal (Tourmaline); Cleavage: Perfect basal.

Hardness
2
Color
Lavender, lilac, pink
Luster
Pearly to vitreous
Identified More igneous →

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Physical properties

Hardness: 2.5-3 (Lepidolite), 7-7.5 (Tourmaline); Color: Lavender, lilac, pink; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (Mica) and Trigonal (Tourmaline); Cleavage: Perfect basal.

Formation & geological history

Formed in granitic pegmatites during the final stages of magma crystallization. These lithium-rich environments allow for the growth of rare minerals like lepidolite and tourmaline.

Uses & applications

Major lithium source for batteries and electronics; the pink tourmaline inclusions are highly valued as gemstones for jewelry and lapidary work.

Geological facts

Lepidolite is known as the 'peace stone' in metaphysical circles due to its high lithium content, which is used in mood-stabilizing medications.

Field identification & locations

Identify by the sparkling, mica-like lavender matrix (lepidolite) containing distinct prismatic pink crystals (rubellite). Common in Pala, California and Minas Gerais, Brazil.

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