Liddicoatite | Gemopedia

Liddicoatite is a calcium-rich lithium species of tourmaline named in 1977 in honor of noted gemologist Richard T. Liddicoat. Gems may form in green, pink, red, blue and purple colors, sometimes with internal multicolor banding and zoning. Large crystals are often sliced to display their natural multicolor designs.
Alternate
Names
Fluor-Liddicoatite
Colors
Green, Red, Pink, Purple, Blue, Colorless, Black, Brown, Yellow, Orange, Frequently Multi-Colored

Liddicoatite Classification

Common Name

Liddicoatite

Species

Liddicoatite

Variety

Colors

Green, Red, Pink, Purple, Blue, Colorless, Black, Brown, Yellow, Orange, Frequently Multi-Colored

Alternate Names

Fluor-Liddicoatite

Gemstone Groups

Tourmaline

Key Separations

appearance, refractive index and high birefringence; then optic figure, pleochroism and specific gravity

Comments

Name after Richard T. Liddicoat pioneering gemologist at GIA

Liddicoatite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.624
Tolerance:-1.22222222222222

Birefringence

0.018-0.02

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: weak fire Value: 0.017

Comments

Liddicoatite Chemistry & Crystallography

Chemical Name

calcium lithium aluminum bora-silicate hydroxide

Chemical Formula

Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Liddicoatite Characteristic Physical Properties

Hardness

7.5

Streak

Light Brown, White

Specific Gravity

Typical:3.02

Toughness

Good

Inclusions

Liddicoatite is a type II clarity stone. Stones might contain liquid and gas inclusions that are long and thin, reflective gas-filled fractures and color zoning.

Luster

Vitreous

Stability

Very Good

Fracture

Conchoidal, Uneven

Cleavage

Poor, in two directions

Comments

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