How to identify Lepidolite

To correctly identify Lepidolite (Lepidolite), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Typically lilac, pink, purple, or rose-red. Less commonly gray, yellowish, or colorless.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous to pearly on cleavage surfaces.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Often found in fine-grained, scaly aggregates, or as larger tabular to pseudohexagonal crystals. Can also be massive.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Monoclinic, typically forming tabular to pseudohexagonal crystals, often with a platy or scaly habit. Can also be massive or granular.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Perfect basal cleavage (001), allowing it to be split into thin, flexible, elastic sheets.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Primarily in lithium-rich granitic pegmatites, often associated with quartz, feldspar, spodumene, tourmaline, and beryl. Also found in high-temperature hydrothermal veins and greisens.

Key Facts

Hardness

2.5-3.5 on the Mohs scale

Specific Gravity

2.8-2.9 g/cm³

Crystal System

Monoclinic

Color

Lilac, pink, purple, rose-red, gray, yellowish, colorless

Luster

Vitreous to pearly

Transparency

Transparent to translucent

Fracture

Uneven to splintery (not commonly observed due to perfect cleavage)

Cleavage

Perfect basal cleavage (001)

Composition

Potassium lithium aluminum fluorohydroxysilicate

Physical characteristics

• Crystal Habit: Tabular, pseudohexagonal, platy, scaly aggregates, massive, granular
• Cleavage Type: Perfect basal cleavage (001)
• Fracture Type: Uneven to splintery
• Tenacity: Flexible, elastic
• Luster Type: Vitreous to pearly

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