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  • Andesine-Labradorite

Andesine-Labradorite

Feldspar

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: October 2021
Andesine-Labradorite Polished Andesine-Labradorite Rough Andesine-Labradorite Jewelry
Table of Contents
  • General Information
  • Andesine-Labradorite Colors
  • Countries of Origin

Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. Its name "andesine" refers to the Andes Mountains where andesine was first found and the name "labradorite" was derived from Labrador, Canada, where labradorite was first discovered. So why the hyphenated name? Chemically speaking, our material falls between andesine and labradorite, so we chose to hyphenate and use both terms to be more accurate and descriptive.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Andesine-Labradorite
Species
Feldspar
Transparency
Transparent - Semitranslucent
Refractive Index
1.558-1.570
Birefringence
0.009
Optic Character
Biaxial
Optic Sign
Positive or Negative
Polariscope Reaction
Doubly Refractive (DR)
Pleochroism
None
Hardness
6-6.5
Streak
White
Specific Gravity
2.640-2.740
Toughness
Poor
Luster
Vitreous
Stability
Good
Cleavage
Perfect, in two directions
Chemical Name
calcium or sodium silicate
Chemical Formula
NaAlSi3O8 or CaAl2Si2O8
Crystal System
Triclinic
Chemistry Classification
Silicate

Andesine-Labradorite Colors

  • Green Andesine-Labradorite
    Green
  • Yellow Andesine-Labradorite
    Yellow
  • Orange Andesine-Labradorite
    Orange
  • Red Andesine-Labradorite
    Red
  • White Andesine-Labradorite
    White
  • Gray Andesine-Labradorite
    Gray
  • Colorless Andesine-Labradorite
    Colorless

Countries of Origin

Canada; Russian Federation; Unknown; Norway; Japan; United States of America; Brazil; Italy; Mexico; France; Germany; India

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