Teradora Gem Guide and Properties Chart

TeredoraTM is a trade name for Triphane or Yellow Spodumene. The stones are mined from Afghanistan and Brazil. Prolonged exposure to sunlight or UV light will cause the color to fade. Stones are difficult to facet due to perfect cleavage.

General Information

Classification
Optical Properties
Characteristic Physical Properties
Chemistry & Crystallography

Common Name

Teradora

Species

Spodumene

Dispersion

Strength: Weak Fire Value: 0.017

Refractive Index

1.660-1.676 Tolerance: (+0.005/-0.005)

Birefringence

0.014- 0.016

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

Pleochroism

Trichroic, Various shades of body color if visible

Hardness

6.5-7

Streak

White

Specific Gravity

3.150-3.210 Typical:3.180

Toughness

Poor

Inclusions

Teredora^TM is a type I clarity stone. Stones might contain growth and etch tubes, healing cracks, liquid and multi-phase inclusions.

Luster

Vitreous

Fracture

Uneven, Splintery

Cleavage

Perfect, in two directions

Chemical Name

lithium aluminum silicate

Chemical Formula

LiAlSi₂O₆

Crystal System

Monoclinic

Chemistry Classification

Silicate

Teradora Colors

Yellow

Alternate Names

Triphane, Yellow Spodumene

Countries of Origin

Afghanistan; United States of America (the); Unknown; Brazil

Care

Gentle care. Prolonged exposure to light, especially UV and sunlight, will cause fading. Some stones cleave or fracture easily. Wear with care.