Lepidolite | Gemopedia

Lepidolite is a beautiful lithium-rich member of the mica mineral family. Violet to pink in color, lepidolite has a scaly appearance seen in many specimens. This gemstone is not commonly known to be faceted and is primarily used in ornamental and decorative pieces.
Alternate
Names
Lithia Mica, Lithium Mica
Colors
Violet, Pink, Red, Gray-White

Lepidolite Classification

Common Name

Lepidolite

Species

Lepidolite

Variety

Colors

Violet, Pink, Red, Gray-White

Alternate Names

Lithia Mica, Lithium Mica

Gemstone Groups

Mica

Key Separations

RI, appearance

Comments

Lepidolite is often misidentified as pink muscovite or phlogopite.

Lepidolite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.525-1.587

Birefringence

0.018-0.038

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Lepidolite Chemistry & Crystallography

Chemical Name

basic potassium lithium aluminum fluoro-silicate

Chemical Formula

K(Li,Al)3(Si,Al)4O10(F,OH)2

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Lepidolite Characteristic Physical Properties

Hardness

2.5-3

Streak

White

Specific Gravity

2.8-3.3

Toughness

Inclusions

Many lepidolite specimens have a scaly appearance.

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Perfect, in one direction

Comments

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